Synonyms of the word

negligent

• adj. Careless, without appropriate or sufficient attention.
• adj. (law) Culpable due to negligence.

careless

• adj. (archaic) Free from care; unworried, without anxiety.
• adj. Not concerned or worried (about).
• adj. Not giving sufficient attention or thought, especially concerning the avoidance of harm or mistakes.

delinquent

• adj. Late or failing to pay a debt or other financial obligation, like a mortgage or loan.
• adj. Failing in or neglectful of a duty or obligation; guilty of a misdeed or offense.
• n. One who disobeys or breaks rules or laws.
• n. (obsolete) a term applied to royalists by their opponents in the English Civil War 1642 - 1645. Charles…

derelict

• adj. Abandoned, forsaken; given up by the natural owner or guardian; (of a ship) abandoned at sea, dilapidated,…
• adj. Negligent in performing a duty.
• adj. Lost; adrift; hence, wanting; careless; neglectful; unfaithful.
• n. Property abandoned by its former owner, especially a ship abandoned at sea.
• n. (dated) An abandoned or forsaken person; an outcast.
• n. A homeless and/or jobless person; a person who is (perceived as) negligent in their personal affairs and…

hit-and-run

• n. Alternative spelling of hit and run.
• adj. Of, pertaining to, or being a hit and run.

inattentive

• adj. Of or pertaining to lack of attention; not paying attention; careless.

lax

• n. (now chiefly Britain dialectal, Scotland) A salmon.
• adj. lenient and allowing for deviation; not strict.
• adj. loose; not tight or taut.
• adj. lacking care; neglectful, negligent.
• adj. (archaic) Having a looseness of the bowels; diarrheal.
• adj. (mathematics) Describing an associative monoidal functor.
• n. (slang) Lacrosse.

neglectful

• adj. Tending to neglect; failing to take care of matters which require attention.

remiss

• adj. At fault; failing to fulfill responsibility, duty, or obligations.
• adj. Not energetic or exact in duty or business; careless; tardy; slack; hence, lacking earnestness or activity;…

slack

• n. (uncountable) Small coal; coal dust.
• n. (countable) A valley, or small, shallow dell.
• n. (uncountable) The part of anything that hangs loose, having no strain upon it.
• n. (countable) A tidal marsh or shallow, that periodically fills and drains.
• adj. Lax; not tense; not hard drawn; not firmly extended.
• adj. Weak; not holding fast.
• adj. Remiss; backward; not using due diligence or care; not earnest or eager.
• adj. Not violent, rapid, or pressing.
• adj. (slang, West Indies) vulgar; sexually explicit, especially in dancehall music.
• adv. Slackly.
• v. To slacken.
• v. (obsolete) To mitigate; to reduce the strength of.
• v. (followed by “off”) to procrastinate; to be lazy.
• v. (followed by “off”) to refuse to exert effort.
• v. To lose cohesion or solidity by a chemical combination with water; to slake.