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reckless

/ˈɹɛkləs/ adjective

In Latin: incautus Wiktionary

Origin

From Middle English rekles, reckeles, rekkeles, (also recheles), from Old English rēcelēas (“reckless, careless, negligent”), equivalent to reck + -less. Cognate with West Frisian roekeleas (“reckless”), Dutch roekeloos (“reckless”), German Low German ruuklos (“careless”), German ruchlos (“careless, notorious”).

From Wiktionary, via Kaikki.org (CC BY-SA)