If you are unafraid to do something, you are confident and not at all nervous about doing it.
例句
He is a man with a reputation for being tough and unafraid of unpopular decisions...他作风强悍，作决定不怕得罪人，这是出了名的。She was a forceful intellectual unafraid to speak her mind.她是个很有魄力的知识分子，不惧怕说出自己的想法。
英汉词典释义
adj.
不害怕的;无所畏惧的
She is a skier who is unafraid of danger.她是一名敢于冒险的滑雪者。
英英词典释义
Adjective
1. oblivious of dangers or perils or calmly resolute in facing them
2. free from fear or doubt; easy in mind;
"secure himself, he went out of his way to help others"