WordWeb Online

1. Not dangerous to health; not recurrent or progressive (especially of a tumour)
    
2. Pleasant and beneficial in nature or influence
   "a benign smile"; "the benign sky"; "the benign influence of pure air"
   - benignant
    
3. Kindness of disposition or manner
   "the benign ruler of millions"; "benign intentions"

See also: benignancy, benignity, graciousness, harmless, kind, kindly

Antonym: malign, malignant

Encyclopedia: Benign