nightmare Meaning, definition in Cambridge English Dictionary
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Meaning of "nightmare" - English Dictionary

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nightmarenoun [C]

uk   /ˈnaɪt.meər/  us   /-mer/
B1 a very upsetting or frightening dream: a terrifying nightmare I shouldn't have watched that movie - it'll give me nightmares.B1 an extremely unpleasant event or experience or possible event or experience: The whole journey was a nightmare - we lost our luggage and both flights were delayed. Being trapped underwater is my worst nightmare.
More examples
nightmarish
adjective uk   /-meə.rɪʃ/  us   /-mer.ɪʃ/
a nightmarish traffic jam
nightmarishly
adverb uk   /-meə.rɪʃ.li/  us   /-mer.ɪʃ.li/
(Definition of nightmare from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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