slacker, shirker -- (a person who shirks his work or duty (especially one who tries to evade military service in wartime))
Overview of adj slack
The adj slack has 3 senses
loose, slack -- (not tense or taut; "the old man's skin hung loose and grey"; "slack and wrinkled skin"; "slack sails"; "a slack rope")
slack -- (flowing with little speed as e.g. at the turning of the tide; "slack water")
lax, slack -- (lacking in rigor or strictness; "such lax and slipshod ways are no longer acceptable"; "lax in attending classes"; "slack in maintaining discipline")
(TTS Sound)
