adverb
fearlessly; boldly; without showing fear
Describes acting without any sign of fear or hesitation, often in the face of something intimidating. The phrase is a set adverbial expression.
彼は恐れ気もなく上司に反論した。
He fearlessly argued back against his boss.
その子は恐れ気もなく大きな犬に近づいた。
The child approached the big dog without any sign of fear.