Definition of derelict :
1. A thing voluntary abandoned or willfully cast away by its proper owner, especially a ship abandoned at sea.
2. A tract of land left dry by the sea, and fit for cultivation or use.
3. Given up or forsaken by the natural owner or guardian; left and abandoned; as, derelict lands.
4. Lost; adrift; hence, wanting; careless; neglectful; unfaithful.
overdue, bereft, abandoned, weak, weakly, deserted, desolate, woebegone, rheumatic, flea-bitten, broken-down, slack, tatterdemalion, sapless, draggled, arthritic, rheumatoid, ramshackle, infirm, bedraggled, tumble-down, creaky, debile, tattered, keep, rickety, decrepit, woeful, dilapidated, lorn, forsaken, lax, careful, abandoned ship, screaky, feeble, rheumy, delinquent, forlorn, run-down
abandoned (part of speech: verb)
neglectful (part of speech: adjective)
inattentive, slapdash, remiss, neglectful, bumbling, senile, perfunctory, inconsiderate, haphazard, forgetful, thoughtless, sloppy, shoddy, unmindful, clumsy, hit-and-miss, negligent, inadvertent, slipshod, unheedful, slovenly, disregardful, careless, reckless