Synonyms of careless in English:

careless


See definition of careless

adjective

1‘careless motorists’

SYNONYMS
inattentive, incautious, negligent, remiss
forgetful, absent-minded
heedless, irresponsible, impetuous, reckless
informal sloppy, couldn't care less, slap-happy
ANTONYMS

careful, attentive

2‘an unsatisfactory excuse for incomplete or careless work’

SYNONYMS
shoddy, slapdash, slipshod, scrappy, slovenly, unconsidered, amateurish, negligent, lax, slack, wild, disorganized
hasty, hurried, perfunctory, cursory, thrown together, sketchy, hit-or-miss
inaccurate, imprecise, inexact, incorrect, wrong, erroneous, error-ridden
informal sloppy, slap-happy, scatterbrained
vulgar slang half-arsed
ANTONYMS

meticulous

3‘a careless remark’

SYNONYMS
thoughtless, unthinking, insensitive, indiscreet, unguarded, ill-advised, ill-considered, ill-thought-out, unwise, misguided, incautious, inadvertent, rash, foolhardy
hasty, spur-of-the-moment, hare-brained
ANTONYMS

judicious

4‘they were careless of their personal appearance’

SYNONYMS
negligent in, mindless of, heedless of, improvident about, unconcerned about, indifferent to, oblivious to
reckless about, remiss in, slapdash about, slipshod about, frivolous about
informal sloppy in, messy in

5‘she saw him leaning with careless masculine grace against the wall’

SYNONYMS
unstudied, artless, casual, effortless, unconcerned, nonchalant, insouciant, languid, leisurely, informal
informal couldn't-care-less