careless

Definitions

Not giving sufficient attention or thought to avoiding harm or errors.

Done or acting in a way that lacks proper care or attention.

Free from anxiety or responsibility; unconcerned.

Examples

It was careless of him to leave the front door unlocked while he was away.

Her careless mistake on the final exam cost her the top grade in the class.

He is known for being a careless driver who often ignores traffic signals.

Synonyms

negligent reckless heedless thoughtless inattentive sloppy lax

Antonyms

careful meticulous attentive cautious thorough diligent precise