pshaw

/ʃɔː/
interjection
  1. Used to express disbelief, irritation, or dismissal of something as unimportant or untrue.
    • Pshaw! I don't believe a word of that story.
    • Pshaw! That old rumor isn't worth our time.
    • When he said he could run a mile in four minutes, she just said, 'Pshaw!'
Synonyms
verb
  1. To say 'pshaw' as an expression of disbelief or dismissal.
    • He pshawed at the suggestion that the project would fail.
    • She pshawed loudly when the politician made that claim.
    • They all pshawed at the idea of a ghost in the attic.