this post was submitted on 28 Apr 2026
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For example, "flammable" and "inflammable" both describe an object that can easily catch on fire. I can also think of "ceased" and "deceased", both of which can mean someone or something has been brought to an end.

edit: Some people are including words that can also mean its opposite (like sanction or table), those are cool too! The more weird words, the better!

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[–] scoste@discuss.tchncs.de 42 points 3 weeks ago (1 children)

Up and down

“Are you up for that?” “Yeah, I’m down”

"Are you down for that?" "Yeah, I'm up"

[–] insomniac_lemon@lemmy.cafe 39 points 3 weeks ago* (last edited 3 weeks ago) (3 children)

Dust. Dust the shelf, dust the loaf with flour.

Well, this is the opposite thing (same word meaning opposite) but if you ask me it's the same.

EDIT: For some that fit better: thaw and unthaw, terminate and exterminate, valuable and invaluable

[–] CubitOom@infosec.pub 14 points 3 weeks ago (2 children)

I think valuable / invaluable actually have different meanings. Something which is invaluable, is so important a value should not be assigned.

[–] Tollana1234567@lemmy.today 6 points 3 weeks ago (1 children)

invaluable would be equivalent to priceless.

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[–] Beacon@fedia.io 8 points 3 weeks ago

That's called a contronym, which (as you said) is different than what OP is looking for

https://en.wikipedia.org/wiki/Contronym

[–] Bonifratz@piefed.zip 6 points 3 weeks ago

Caregiver/caretaker is a fun one I had never considered.

[–] fireweed@lemmy.world 29 points 3 weeks ago* (last edited 3 weeks ago) (13 children)

Two examples where erroneous usage has resulted in this paradox:

  • Regardless and irregardless

  • "I couldn't care less" and "I could care less"

[–] ArgumentativeMonotheist@lemmy.world 14 points 3 weeks ago (3 children)

I don't think either were ever said by competently literate people (wtf is "irregardless"? And do they mean they could "care less" about a subject or do they mean the opposite but don't understand negation?) so idk if this fits what OP was saying entirely. They're just obvious mistakes that have been normalized as people got dumber, right?

[–] TORFdot0@lemmy.world 3 points 3 weeks ago (1 children)

Irregardless means “without a lack of regard”. Ergo vis-à-vis if you say irregardless you are actually fully regarded

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[–] inb4_FoundTheVegan@lemmy.world 23 points 3 weeks ago (1 children)

"flammable" and "inflammable" both describe an object that can easily catch on fire.

WHAT A COUNTRY!

[–] MajorMajormajormajor@lemmy.ca 10 points 3 weeks ago

Hi Dr.Nick!

[–] ignirtoq@feddit.online 17 points 3 weeks ago (2 children)

To bone and to debone both mean to remove bones from something, typically food.

[–] pruwybn@discuss.tchncs.de 5 points 3 weeks ago (1 children)

Similarly, peel and unpeel.

[–] Okokimup@lemmy.world 5 points 3 weeks ago (1 children)

Hulled means either the hull is still present or has been removed.

[–] Beacon@fedia.io 4 points 3 weeks ago

Unpitted DO have pits, and pitted have NO pits.

Sounds so backwards. The problem is they're referring to the verb of the word "pit", meaning "removing the pit". So "unpitted" means "not removing the pit". So dumb.

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[–] UnspecificGravity@piefed.social 14 points 3 weeks ago (4 children)

Literally means either literally or figuratively, and context doesn't really help.

[–] 1D10@lemmy.world 13 points 3 weeks ago (2 children)

Literally literally means figuratively, or literally, however figuratively literally only means figuratively.

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[–] cropsec@lemmy.dbzer0.com 12 points 3 weeks ago (3 children)
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[–] chunes@lemmy.world 12 points 3 weeks ago (1 children)

Near miss and near hit both mean a close call.

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[–] jtrek@startrek.website 10 points 3 weeks ago (1 children)

Sanction can mean a punishment or an authorization.

Came up in a DND game where a devil's contract said the players crossing the region would be sanctioned, or something like that. Players thought it meant they had permission, fine print said they would be punished.

[–] Sualtam@lemmus.org 5 points 3 weeks ago

It means authorized decision. The decision can be a punishment.

[–] chunes@lemmy.world 10 points 3 weeks ago (1 children)

One that sorta works:

it's all uphill / downhill from here -> it's only going to get worse

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[–] Klear@quokk.au 10 points 3 weeks ago (2 children)

This is kinda the opposite to what you are asking: awesome and awful used to mean the same thing IIRC, both being something filling you with awe. Later the meanings split between positive and negative.

Same with terrible and terrific.

[–] mimavox@piefed.social 6 points 3 weeks ago (2 children)

As a non-native English speaker, I always have to think a second extra about "terrific", about it being negative or positive. Probably because it sound similar to "terrible".

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[–] Korhaka@sopuli.xyz 4 points 3 weeks ago (1 children)

I often thought awful was an odd word. Surely awful = full of awe, but it is frequently used to describe things that have little to no awe.

Also I have now said the word awe too much and it looks strange.

[–] Beacon@fedia.io 3 points 3 weeks ago

My guess is it came about because people were using it to mean "something so bad it fills you with awe". Like "the thing humans are doing to the environment are awful". But then it lost its connection to awe.

That's my guess.

[–] ThatGuy46475@lemmy.world 8 points 3 weeks ago (3 children)

One way mirror and two way mirror

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[–] unmagical@lemmy.ml 8 points 3 weeks ago

Antiautonym is what you're looking for.

[–] EndOfLine@lemmy.world 7 points 3 weeks ago (1 children)
[–] Rai@lemmy.dbzer0.com 2 points 3 weeks ago

What a country!

[–] vividspecter@aussie.zone 7 points 3 weeks ago (3 children)

Slightly different, but single words meaning multiple conflicting things seem to come to mind more readily:

  • Drop meaning both abandon and release
  • Table meaning both put something aside or putting up for discussion
  • Literally meaning both literal and figurative
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[–] Grail@multiverse.soulism.net 7 points 3 weeks ago

The undead are dead.

[–] GalacticSushi@piefed.blahaj.zone 6 points 3 weeks ago (4 children)

Garnish can either be an enhancing addition such as in a dish, or to take something away such as garnishing wages.

You can lease/rent something to a tenant... Or you can lease/rent something from someone.

The informal definition of "literally" is an exaggeration of something that is not literally true. Inn other words, figuratively.

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[–] TropicalDingdong@lemmy.world 5 points 3 weeks ago

I literally can't believe this thread.

[–] Quilotoa@lemmy.ca 5 points 3 weeks ago

Yeah, right.

[–] clag@lemmy.dbzer0.com 4 points 3 weeks ago

For Australians, yeah, yeah nah, yeah yeah nah, nah, nah yeah nah, nah nah yeah, all have subtly different positive and/or negative meanings, often dependent on the situation.

[–] FinjaminPoach@lemmy.world 4 points 3 weeks ago* (last edited 3 weeks ago) (1 children)
  • Restless and Restful.
  • a bit of a stretch but i can imagine someone saying "You're a natural" and "you're a freak" to express someone being abnormally talented at something on their first try.
  • mark and demarcate. I love this one.
  • also, limit and delimit

"You're a natural at rock climbing. You're a rock climbing freak. A freak at rock climbing."

[–] FinjaminPoach@lemmy.world 3 points 3 weeks ago (1 children)

While checking words that might work here i was reminded of this annoying trio:

  • Allude
  • Elude
  • Illude

They mean, respectively:

  • to suggest something
  • to escape or avoid something or someone
  • to lie or deceive
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[–] EndlessNightmare@reddthat.com 4 points 3 weeks ago

Not the original question you asked, but fits in with your edit:

Priceless and worthless are opposites

[–] BuboScandiacus@mander.xyz 4 points 3 weeks ago* (last edited 3 weeks ago)

In French there is personne (someone) and personne (no one), plus (more) and plus (no more)

[–] iatenine@piefed.social 4 points 3 weeks ago (1 children)

They're called "contranyms". Easy to find examples once you know that

https://en.wikipedia.org/wiki/Contronym

[–] Beacon@fedia.io 6 points 3 weeks ago

No that's different. A contronym is where the same single word has two opposing meaning. OP is asking for two separate words that sounds like they should be opposites but actually have the same meaning, like flammable and inflammable which both mean "can catch on fire".

[–] Tollana1234567@lemmy.today 2 points 3 weeks ago* (last edited 3 weeks ago) (2 children)

deceased specifically refers to death though. ceased mean something stopped in its track. " no offense and offensive" means the same thing if the context is describing someone or something.

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