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Definitions of sinister
  1. adjective
    stemming from evil characteristics or forces; wicked or dishonorable
    "the scheme of some sinister intelligence bent on punishing him"

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  2. adjective
    threatening or foreshadowing evil or tragic developments
    "sinister storm clouds" "a sinister smile"
  3. adjective
    on or starting from the wearer's left
    "bar sinister"

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