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

     

    innocuous

     adjective
    adjective
    BrE BrE//ɪˈnɒkjuəs//
     
    ; NAmE NAmE//ɪˈnɑːkjuəs//
     
    (formal)
     
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  1. 1not intended or likely to offend or upset anyone synonym harmless (2) It seemed a perfectly innocuous remark.
  2. 2not harmful or dangerous synonym harmless (1) an innocuous substance
  3. Word Origin late 16th cent.: from Latin innocuus, from in- ‘not’ + nocuus ‘injurious’, from nocere ‘to hurt’.Extra examples The liquid looked fairly innocuous. The question appeared innocuous enough, but I still did not trust her. Some mushrooms look innocuous but are actually very poisonous.
See the Oxford Advanced American Dictionary entry: innocuous