"fearless" in the adjective sense
1. unafraid, fearless
oblivious of dangers or perils or calmly resolute in facing them
2. audacious, brave, dauntless, fearless, hardy, intrepid, unfearing
invulnerable to fear or intimidation
"audacious explorers"
"fearless reporters and photographers"
"intrepid pioneers"
Source: WordNet® (An amazing lexical database of English)
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