ニヘッ

ニヘッ, にへっ, ニヘっnihe

adverb

  1. with a broad grin
  2. with a smirk
  3. with a cheeky smile

Study it in Yanamino

Data from JMdict, KANJIDIC2 (EDRDG), KanjiVG, CC-CEDICT and Make Me a Hanzi. Sources and licences