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Definition of nightmarish adjective from the Oxford Advanced Learner's Dictionary

nightmarish

adjective
 
/ˈnaɪtmeərɪʃ/
 
/ˈnaɪtmerɪʃ/
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  1. very frightening and unpleasant; very difficult to deal with
    • nightmarish living conditions
trait
noun
 
 
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Oxford 5000
B2
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