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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.

Since this nightmare began nearly two weeks ago, the Mets have averaged just 1.7 runs per game, worst in the major leagues.

From The Wall Street Journal • Apr. 20, 2026

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

From Slate • Apr. 19, 2026

And I was like 'oh my god, this is just 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

Suddenly, one of my favorite sights in the whole world is turned into nightmare material.

From "Kwame Crashes the Underworld" by Craig Kofi Farmer