Doubled (ぺらぺら) · #449 by frequency · Often written in katakana

へらへら

ヘラヘラ

(laughing) foolishly

Family

Senses

  1. (laughing) foolishly, (smiling) thoughtlessly
  2. indiscreetly (talking), carelessly (speaking), frivolously, flippantly
  3. thin (paper, cloth, etc.), flimsy
More meanings
  1. flaring up, bursting into flames archaic

See へらへら on Jisho.