part of speech: adjective
definition 1: not paying close attention; not careful or watchful.
- A careless driver didn’t see the light turn red.
antonyms: attentive, careful
definition 2: showing a lack of planning, thought, or interest.
- He made many careless mistakes on his test.
synonyms: offhand, thoughtless
derivations: carelessly (adv.), carelessness (n.)