muttsuri
Being gloomily silent and uncommunicative, with a brooding, sulky expression. Someone who keeps their feelings hidden behind a stern face.
💡Used for someone who won't talk, sits silently with a grim face, or hides their true feelings.
彼はむっつりと黙り込んで、何を考えているかわからなかった。
He sat silently with a sullen expression, and no one could tell what he was thinking.
He just sat there ___ without saying a word all evening.
彼は一晩中___と黙り込んでいた。