むっつり
muttsuri

Suru Verb
To-Adverb

1. sullenly; taciturnly; morosely; gloomily; silently

Onomatopoeia
彼女 かのじょはむっつりとした表情 ひょうじょう かべていた。
kanojowa muttsurito shita hyōjōo ukabete ita.
She had a sullen look on her face.
Noun

2. taciturn person; uncommunicative person