1. marked by lack of attention or consideration or forethought or thoroughness; not careful

- careless about her clothes

- forgotten by some careless person

- a careless housekeeper

Similar word(s): casual, cursory, passing, perfunctory, superficial, haphazard, slapdash, slipshod, sloppy, heedless, reckless, incautious, offhand, offhanded, incautious, unconcerned, negligent, superficial, imprudent

2. effortless and unstudied

- an impression of careless elegance

- danced with careless grace

Similar word(s): artless

3. (usually followed by `of') without due thought or consideration

- careless of the consequences

Similar word(s): heedless, unheeding, regardless

Sentences with careless as an adjective:

- Jessica was so careless that she put her shorts on backwards.