noun
A somewhat literary or formal noun for a feeling of fear or dread. Often used in set phrases like 恐れ気もなく (fearlessly, without showing fear).
彼は恐れ気もなく暗い森に入っていった。
He went into the dark forest without any sign of fear.
その知らせを聞いて、彼女の顔に恐れ気が走った。
Upon hearing the news, a look of fear crossed her face.
Compound of 恐れ (fear) + 気 (sign, feeling). The exact historical derivation is uncertain, but the combination conveys a sense of 'air of fear'.