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Definitions

nightmare

[nahyt-mair] / ˈnaɪtˌmɛər /
NOUN
bad dream or experience
Synonyms
STRONGEST
dream fantasy hallucination horror ordeal vision
STRONG
fancy illusion incubus phantasm succubus torment trial tribulation
Antonyms
STRONGEST
actuality fact pleasure reality truth
STRONG
certainty happiness peace
WEAK
daymare

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

He said that he’d been having a recurring nightmare.

From Slate • Apr. 19, 2026

Kieran Trippier looked like he was reliving a nightmare.

From BBC • Apr. 18, 2026

But the basic point remains: There is absolutely no good reason, none, for this annual tax nightmare.

From MarketWatch • Apr. 18, 2026

For an artist like Lori, who works part-time at a Chinese food truck while painting and writing art criticism on the side, the job is both a dream and a nightmare.

From Salon • Apr. 17, 2026

I was in the middle of a nightmare, and my nerves were on fire.

From "Code Name Kingfisher" by Liz Kessler