Etymology
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dismissive (adj.)

1640s, "characterized by or appropriate to dismissal;" from dismiss + -ive. Meaning "contemptuous, tending to reject as insignificant" is recorded by 1922 (implied in dismissively). Related: Dismissiveness.

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Definitions of dismissive

dismissive (adj.)
showing indifference or disregard;
`chronic fatigue syndrome' was known by the dismissive term `housewife syndrome'
a dismissive shrug
the firm is dismissive of the competitor's product
dismissive (adj.)
stopping to associate with;
they took dismissive action after the third violation
From wordnet.princeton.edu