An onomatopoeic word expressing complete silence or a deathly quiet — the stillness of a place or the hush after something awkward.
試験中の教室はしーんと静まり返っていた。
The classroom was deathly quiet during the exam.
彼の冗談にみんながしーんとなってしまった。
Everyone went silent after his joke.
夜、雪が降り始めると町はしーんとした。
At night, when the snow began to fall, the town became very quiet.