"slacker" in the noun sense
1. slacker, shirker
a person who shirks his work or duty (especially one who tries to evade military service in wartime)
"slacker" in the adjective sense
1. loose, slack
not tense or taut
"the old man's skin hung loose and grey"
"slack and wrinkled skin"
"slack sails"
"a slack rope"
"a slack grip"
2. slack
flowing with little speed as e.g. at the turning of the tide
"slack water"
3. lax, slack
lacking in rigor or strictness
"such lax and slipshod ways are no longer acceptable"
"lax in attending classes"
"slack in maintaining discipline"
Source: WordNet® (An amazing lexical database of English)
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