From Longman Dictionary of Contemporary Englishdauntlessdaunt‧less /ˈdɔːntləs $ ˈdɒːnt-/ adjective CONFIDENTconfident and not easily frightened dauntless optimism
Examples from the Corpus
dauntless• Fortunately, too, he had at least one dauntless and resourceful boy of school age to assist.• It is here that the dauntless cavalrymen of Ellyrion rest when they return from their long sweeps through their embattled land.• dauntless courage• But the dauntless Hugh came up those stairs, quietly keeping his vision intact. 