brush-off

/B R AH1 SH AO1 F/
noun
  1. 1

    An abrupt rebuff, a snub or curt rejection, a disdainful dismissal.

    โ€œA halfhearted โ€œthank youโ€ may be a brush-off.โ€

Source: https://en.wiktionary.org/wiki/brush-off