pea-brain

/P IY1 B R EY0 N/
noun
  1. 1

    A stupid or clumsy person; a cretin.

adjective
  1. 1

    Stupid, clumsy, idiot

Synonyms

Source: https://en.wiktionary.org/wiki/pea-brain, https://en.wiktionary.org/wiki/peabrain