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enantiosemy 

A linguistic phenomenon whereby a word constitutes its own antonym depending on context. English, being widely spoken and/or occasionally mangled in the United States and recalcitrant parts of the commonwealth (i.e., Canada), features many enantiosemic words, including inflammable, nonplussed, and restive (with the latter meaning "impatient and fidgety" when applied to people and, owing to its French roots, "stubbornly refusing to move" when applied to horses).

From Gr. enantios ("opposite") + semasia ("meaning").
Gord: HOW DO MOUNTIES MANAGE TO BE NONPLUSSED ALL THE TIME, ANYWAY? THERE ARE GUYS WITH RACCOONS IN THEIR JACKETS AND STUFF—

Nigel: Actually, its prefix notwithstanding, and despite plussed's non-status as a word, "nonplussed" means the opposite of what it's commonly thought to mean.

Gord, nonplussed: OKAY, SO WE'RE TALKING ENANTIOSEMY, BUT LOOK, THE HORSE IS RESTIVE, AREN'T YA, BUD?

RCMP Thoroughbred: <snorts and offers an impregnable stare>

Inflammable means flammable? What a country! What enantiosemy!
―Dr. Nick Riviera, whose doctorate is in linguistics, not medicine
enantiosemy by DrSJohnson November 26, 2019
That second shot off the bunker was egantic.
egantic by ben v. June 9, 2005
alternate definition: any breast size larger than a double D.
Her breasts are egantic.
egantic by Rich Thiel July 3, 2006
Look, Sarah got her hair done just like Evan.
That's so emantic.
emantic by EBfilms January 13, 2009

enantiorhyme

enantiorhyme (noun)

/ɪˌnæn.ti.oʊˈraɪm/

Definition:
A pair of words that rhyme and have opposite meanings (i.e., are antonyms).

Example:
“Cheer” and “jeer” form an enantiorhyme.
“Raise” and “raze” form another.
Cheer’ and ‘jeer’ are an enantiorhyme.
enantiorhyme by Nugget0’nuggs April 18, 2026

Enantiodromia 

The tendency of creating the opposite effect when you go to far to one side of any duality. Example: Always choosing the easy option will make things harder for you in the long run.
Muscle growth is an example of enantiodromia as repeated damage grows the muscle.
Enantiodromia by anonymous August 6, 2025