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slacker
Adjectiveslack has 4 senses
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)
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)