not paying enough attention to what one does: a careless typist.
2.
not exact, accurate, or thorough: careless work.
3.
done or said heedlessly or negligently; unconsidered: a careless remark.
4.
not caring or troubling; having no care or concern; unconcerned (usually followed by of, about, or in): careless of the rights of others; careless about one's behavior; careless in speech.
5.
possessed or caused without effort or art; unstudied: careless beauty.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
a chattering or flighty, light-headed person.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a scrap or morsel of food left at a meal.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.