もの恐おそろしい

i-adjective

vaguely frightening; somehow terrifying; spooky

Describes an indistinct, uneasy fear or creepiness, often without a clear reason.

• 夜よるの森もりはもの恐おそろしい雰ふん囲い気きに包つつまれていた。

  The forest at night was filled with a vaguely frightening atmosphere.

• その古ふるい屋や敷