にへー nihee (en) - matsumurae/onomatodict-jp GitHub Wiki

Pervert smile (when you think of someone you like)

• Type: Gitaigo (擬態語)
• Category: Status.
• Equivalent: No equivalent.
• Source: https://news.livedoor.com/article/detail/19689989/

Examples

「にへー」と笑う彼女は大層幸せそうで、付け入る余地などなさそうです
She seems to be smiling (with a perv one) and there is no room for taking advantage of it.

Related

• Niya-Niya / にやにや
• Nico-Nico / にこにこ