inimicalPronunciation: /ɪˈnɪmɪk(ə)l/Definition of inimical adjective tending to obstruct or harm:the policy was inimical to Britain’s real interests unfriendly; hostile:an inimical alien powerDerivatives inimically adverb Origin: early 16th century: from late Latin inimicalis, from Latin inimicus (see enemy)inimical in other Oxford dictionaries Definition of inimical in the US English dictionary