Definition of benign adjective from the Oxford Advanced American Dictionary

     

    benign

     adjective
    adjective
    NAmE//bɪˈnaɪn//
     
     
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  1. 1 (formal) (of people) kind and gentle; not hurting anyone You would never have guessed his intentions from the benign expression on his face.
  2. 2(medical) (of tumors growing in the body) not dangerous or likely to cause death opposite malignant
 
adverb He smiled benignly.
See the Oxford Advanced Learner's Dictionary entry: benign