benign

Someone or something that is benign is gentle, kind, mild, or unharmful: a benign soul wouldn't hurt a fly.

Benign describes a range of qualities, all of them positive. When talking about a person, it means "gentle." In reference to weather or climate, it means "mild." In some other contexts, it simply means "not harmful"; you might speak of "a benign tumor" or "an environmentally benign chemical." The word comes from a Latin root benignus meaning "well born," but the implied meaning is "kind" or "pleasant" — it's hard to get mad at someone who has a benign disposition.

Definitions of benign
  1. adjective
    kind in disposition or manner
    “the benign ruler of millions”
    benign intentions”
    Synonyms:
    kind
    having or showing a tender and considerate and helpful nature; used especially of persons and their behavior
  2. adjective
    pleasant and beneficial in nature or influence
    “a benign smile”
    “the benign sky”
    “the benign influence of pure air”
    synonyms: benignant
    kindly
    pleasant and agreeable
    harmless
    not causing or capable of causing harm
    kind
    having or showing a tender and considerate and helpful nature; used especially of persons and their behavior
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    Antonyms:
    malign
    evil or harmful in nature or influence
    maleficent
    harmful or evil in intent or effect
    cancerous
    like a cancer; an evil that grows and spreads
    harmful
    causing or capable of causing harm
    unkind
    lacking kindness
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  3. adjective
    not dangerous to health; not recurrent or progressive (especially of a tumor)
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    Antonyms:
    malignant
    dangerous to health; characterized by progressive and uncontrolled growth (especially of a tumor)
    cancerous
    relating to or affected with cancer
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