dismissive

from WordNet (r) 3.0 (2006)

dismissive
    adj 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"

from The Collaborative International Dictionary of English v.0.48

Dismissive \Dis*miss"ive\, a.
   Giving dismission.
   [1913 Webster]