Antonyms of adj diligent

2 senses of diligent

Sense 1
diligent, persevering -- (quietly and steadily persevering especially in detail or exactness; "a diligent (or patient) worker"; "with persevering (or patient) industry she revived the failing business")

INDIRECT (VIA patient) -> impatient -- (restless or short-tempered under delay or opposition; "impatient with the slower students"; "impatient of criticism")

Sense 2
diligent (vs. negligent) -- (characterized by care and perseverance in carrying out tasks; "a diligent detective investigates all clues"; "a diligent search of the files")

negligent (vs. diligent) -- (characterized by neglect and undue lack of concern; "negligent parents"; "negligent of detail"; "negligent in his correspondence")
        => derelict, delinquent, neglectful, remiss -- (failing in what duty requires; "derelict (or delinquent) in his duty"; "neglectful of his duties"; "remiss of you not to pay your bills")
        => lax, slack -- (lacking in rigor or strictness; "such lax and slipshod ways are no longer acceptable"; "lax in attending classes"; "slack in maintaining discipline")
        => hit-and-run (prenominal) -- (involving a driver of a motor vehicle who leaves the scene of an accident)
        => inattentive, neglectful -- (not showing due care or attention; "inattentive students"; "an inattentive babysitter"; "neglectful parents")

Similarity of adj diligent

2 senses of diligent

Sense 1
diligent, persevering -- (quietly and steadily persevering especially in detail or exactness; "a diligent (or patient) worker"; "with persevering (or patient) industry she revived the failing business")
       => patient (vs. impatient) -- (enduring trying circumstances with even temper or characterized by such endurance; "a patient smile"; "was patient with the children"; "an exact and patient scientist"; "please be patient")

Sense 2
diligent (vs. negligent) -- (characterized by care and perseverance in carrying out tasks; "a diligent detective investigates all clues"; "a diligent search of the files")
       => assiduous, sedulous -- (marked by care and persistent effort; "her assiduous attempts to learn French"; "assiduous research"; "sedulous pursuit of legal and moral principles")
       => hardworking, industrious, tireless, untiring -- (characterized by hard work and perseverance)
          Also See-> busy#1; careful#1