Synonyms of devil-may-care

1 Syllable
lax, rash
2 Syllables
jaunty, laxer, larkish, impish, prankish, sporting, jauntier, heedless, pixieish, reckless, raffish, rakish
3 Syllables
hang-loose, outgiving, nonchalant, easygoing, death-defying, relaxed, cavalier, rollicking, foolhardy, incautious, haphazard, free-minded, unalert, careless, negligent, hot-and-cold, unprompted
4 Syllables
nonspecific, impulsive, gamesome, harum-scarum, precipitant, unconcerned, uncareful, unvigilant, desperate
5 Syllables
sportspersonlike, ill-considered, irresponsible, unconsidered, happy-go-lucky, inattentive, lackadaisical, unmeditated
7 Syllables
overventuresome