へらへら

へらへら
adverb, verb (suru)
grinning foolishly
1. grinning foolishly, laughing emptily
Describing an insincere or inappropriate smile or laugh; being frivolous.
へらへら(わら)うな。
Don't grin like a fool.
(かれ)はいつもへらへらしている。
He's always acting frivolously.
へらへらした態度(たいど)()()らない。
I don't like his frivolous attitude.
へらへら(わら)っていないで、真面目(まじめ)にしなさい。
Stop grinning foolishly and be serious.
大事(だいじ)(はなし)をしているのに、へらへらしていて(はら)()った。
I was angry that he was being frivolous while we were having an important conversation.

へらへら is an onomatopoeic expression describing an insincere, foolish, or inappropriate smile/laugh.

CONNOTATION:
Generally negative—suggests lack of seriousness or inappropriate frivolity.

COMMON PATTERNS:

  • へらへら(わら)う: to grin/laugh foolishly
  • へらへらする: to act frivolously
  • へらへらした態度(たいど): frivolous attitude

CONTRAST:

  • にこにこ: pleasant, genuine smile (positive)
  • にやにや: smirk, grin (often negative)
  • げらげら: loud laughter