Definition of fearless adjective from the Oxford Advanced American Dictionary

 

fearless

 adjective
adjective
NAmE//ˈfɪrləs//
 
(approving)
 
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not afraid, in a way that people admire a fearless mountaineer She was fearless and full of energy.
 
adverb
fearlessness
 
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noun [uncountable] He showed complete fearlessness in the face of danger.
See the Oxford Advanced Learner's Dictionary entry: fearless