'nightmarish' definitions:

Definition of 'nightmarish'

adjective

Extremely alarming [syn: bloodcurdling, hair-raising, nightmarish]

Definition of 'nightmarish'

From: GCIDE

nightmarish \nightmarish\ adj. Terrifying, as if in a nightmare[2]; resembling a nightmare[2].
Syn: bloodcurdling, hair-raising. [WordNet 1.5]

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