- loose, slack - not tense or taut; "the old man's skin hung loose and gray"; "slack and wrinkled skin"; "slack sails"; "a slack rope"
Antonym: tense (indirect, via lax)
- flaccid, lax, limp, slack - lacking in strength or firmness or resilience; "flaccid muscles"; "took his lax hand in hers"; "gave a limp handshake"; "a limp gesture as if waving away all desire to know" G.K.Chesterton; "a slack grip"
Antonym: strong (indirect, via weak)
- slack - flowing with little speed as e.g. at the turning of the tide; "slack water"
Antonym: running (indirect, via standing)
- lax, slack - lacking in rigor or strictness; "such lax and slipshod ways are no longer acceptable"; "lax in attending classes"; "slack in maintaining discipline"
Antonym: diligent (indirect, via negligent)
- slacker, shirker - a person who shirks their work or duty (especially one who tries to evade military service in wartime)
--1 is a kind of idler, loafer, do-nothing, layabout, bum
--1 has particulars: goldbrick; malingerer, skulker, shammer; scrimshankerDerived form: verb slack1