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Adjective: dismissive  dis'mi-siv
  1. Showing indifference or disregard
    "a dismissive shrug"; "the firm is dismissive of the competitor's product"; "'chronic fatigue syndrome' was known by the dismissive term 'housewife syndrome'"
  2. Stopping to associate with
    "they took dismissive action after the third violation"

See also: rejective, uninterested