ニヤリ
niyari

To-Adverb

1. meaningfully (smiling, grinning, etc.); suggestively; broadly; sneeringly

Onomatopoeia
にやりと わらって賛成 さんせい意思 いし しめした。
niyarito waratte sansēno ishio shimeshita.
She grinned her approval.
Other forms: