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Synonyms for Reckless (same or very similar meaning)

WordNet sense 1 (characterized by careless unconcern):
heedless

WordNet sense 2 (marked by defiant disregard for danger or consequences):
foolhardy, heady, rash

WordNet sense 3 (fearless and daring):
bold

WordNet sense 4 (marked by lack of attention or consideration or forethought or thoroughness; not careful):
careless


From the ODE community, based on WordNetadd/edit