audacious
adjective
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disposed to venture or take risks“audacious visions of the total conquest of space”daring
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unrestrained by convention or propriety“an audacious trick to pull”barefacedbodaciousbald-facedbrassybrazenbrazen-facedinsolent
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invulnerable to fear or intimidation“audacious explorers”fearlessbravedauntlesshardyintrepidunfearing