Adjective benign has 3 senses
  1. benign - not dangerous to health; not recurrent or progressive (especially of a tumor)
    Antonyms:
    malignant, cancerous
  2. benign, benignant - pleasant and beneficial in nature or influence; "a benign smile"; "the benign sky"; "the benign influence of pure air"
    Antonyms: malign, cancerous, evil, harmful, injurious, malevolent, malignant
  3. benign - of disposition or manner; "the benign ruler of millions"; "benign intentions"
    Antonym:
    unkind (indirect, via kind)
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