part of speech: adjective

definition 1: not paying close attention; not careful or watchful.

  • A careless driver didn’t see the light turn red.

synonyms: negligent

antonyms: attentive, careful

definition 2: showing a lack of planning, thought, or interest.

  • He made many careless mistakes on his test.

synonyms: offhand, thoughtless

antonyms: thoughtful

derivations: carelessly (adv.), carelessness (n.)