negligent

As a verb neglect

is to fail to care for or attend to something.

As a noun neglect

is the act of neglecting.

As an adjective negligent is

careless, without appropriate or sufficient attention.

As adjectives the difference between negligent and truant

is that negligent is negligent (culpable due to negligence) while truant is absent without permission, especially from school.

As a noun truant is

one who is absent without permission, especially from school.

As a verb truant is

to play truant.

Negligent is a synonym of ill-advised.

As adjectives the difference between ill-advised and negligent

is that ill-advised is carried out without the benefit of wise counsel or careful deliberation, or carried out with unwise counsel while negligent is careless, without appropriate or sufficient attention.

As adjectives the difference between slothful and negligent

is that slothful is lazy; inactive; sluggish; indolent; idle; tending to sloth while negligent is careless, without appropriate or sufficient attention.

Unwise is a related term of negligent.

As adjectives the difference between unwise and negligent

is that unwise is not wise; defective in wisdom; injudicious; indiscreet; foolish while negligent is negligent (culpable due to negligence).

As adjectives the difference between supine and negligent

is that supine is lying on its back, reclined while negligent is careless, without appropriate or sufficient attention.

As a noun supine

is a type of verbal noun.

As adjectives the difference between negligent and incompetent

is that negligent is negligent (culpable due to negligence) while incompetent is incompetent.

As adjectives the difference between negligent and complacent

is that negligent is careless, without appropriate or sufficient attention while complacent is uncritically satisfied with oneself or one's achievements; smug.

As adjectives the difference between negligent and idle

is that negligent is negligent (culpable due to negligence) while idle is (lb) empty, vacant.

As a verb idle is

to spend in idleness; to waste; to consume.

As adjectives the difference between negligent and harebrained

is that negligent is careless, without appropriate or sufficient attention while harebrained is absurd, foolish or stupid.