Definition of peacockish in US English:

peacockish

adjective

  • Like or characteristic of a peacock; ostentatious, vain.

Origin

Mid 16th century; earliest use found in John Bale (1495–1563), bishop of Ossory, evangelical polemicist, and historian. From peacock + -ish.

Pronunciation

peacockish

/ˈpiːkɒkɪʃ/