I. adjective
1.
Synonyms: negligent , behindhand, careless, delinquent, derelict, disregardful, lax, neglectful, regardless, remiss
Related Word: dilatory, lackadaisical, lethargic, sluggish; faineant, indolent, lazy, slothful; inert, stagnant
Contrasted words: assiduous, busy, diligent, industrious, sedulous
2.
Synonyms: loose 1, lax, relaxed
Related Word: feeble, infirm, soft, unsteady, weak; inactive, inert, passive, supine; laggard, leisurely, slow
Contrasted words: tensed, tightened; constant, equable, even, steady, uniform; firm, hard
Antonyms: taut, tight
3.
Synonyms: slow 3, down, off, sluggish
II. verb
Synonyms: loose 5, ease, ease off, lax, loosen, relax, slacken, untighten
Idioms: ||cut some slack, make slack
Antonyms: tighten
III. noun
Synonyms: slowdown 1, slackening, slow-up