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ad·verse

adverse

pronunciation:
aed vrs [or] d vrs
part of speech: adjective
definition 1: opposed to or conflicting with one's purposes or desires.
The adverse vote on the director's proposal was unexpected.The captain was used to sailing under adverse conditions.
synonyms:
conflicting, contrary, opposing, oppositional
antonyms:
favorable, propitious
similar words:
antagonistic, at loggerheads, counter, cross, hostile, inimical, negative, thwart, unfavorable, unfortunate
definition 2: producing harmful effects.
The patient had an adverse reaction to the medication.
synonyms:
detrimental, harmful, injurious
antonyms:
beneficial
similar words:
contrary, ill, inimical, noxious, pernicious
definition 3: moving in an opposite direction.
synonyms:
opposite
similar words:
converse, facing, inverse, other, reverse
derivations: adversely (adv.), adverseness (n.)