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Definition of delinquent : 1. Failing in duty; offending by neglect of duty.
2. One who fails or neglects to perform his duty; an offender or transgressor; one who commits a fault or a crime; a culprit.

Synonyms:

tumble-down, careless, inattentive, flea-bitten, blamable, bedraggled, incorrigible, ramshackle, guilty, negligent, shabby, censurable, punctual, tatterdemalion, due, woebegone, red-handed, run-down, slack, punctilious, blameworthy, unpaid, dilapidated, deserted, decrepit, culpable, remiss, creaky, back, derelict, abandoned, faulty, juvenile delinquent, owed, neglectful, reprehensible, broken-down

inauspicious, belated, unpunctual, inexpedient, premature, infelicitous, inappropriate, inopportune, inconvenient, awkward, untimely

outdated, late, tardy, overdue

inept, undesirable, inefficient, disadvantageous, unfit, unsuitable, unsatisfactory

highwayman, mugger, robber, pirate, thief, grafter, culprit, lawbreaker, prowler, burglar, stealer, housebreaker, lifter, hijacker, criminal, outlaw, felon, poacher, larcenist, filcher, larcener, thug, crook, cat burglar, pickpocket

heel, scamp, rascal, lowlife, bad guy, rogue, miscreant, knave, devil, defrauder, traitor, sneak, scalawag, villain, blackguard, evildoer, mischief-maker, gyp, shyster, trickster, swindler, cheat, bastard, rapscallion

mistimed

Usage examples:

• As I failed to do it, after some days, again the Dean sent for me; and finding after question made that I pretty well guessed the delinquent but declined to expose him, the Dean kindly added-" This does you credit, sir," and I left. - "My Life as an Author", Martin Farquhar Tupper.
• Mr. Jerry had just driven into the garage when the delinquent Mary Rose slipped in at the back gate. - "Mary Rose of Mifflin", Frances R. Sterrett.
• If we should attempt to execute the laws of the Union by sending an armed force against a delinquent State, it would involve the good and bad, the innocent and guilty, in the same calamity. - "The Rise and Fall of the Confederate Government, Vol. 1 (of 2)", Jefferson Davis.