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"reckless" is also used as a crossword clue. If that's what you saw, the answer is often irresponsible (13 letters).
Definitions
Careless about danger or consequences.
Word 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”).
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Careless of danger”8 letters
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