slacker

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun a person who shirks his work or duty (especially one who tries to evade military service in wartime)
adjective not tense or taut
adjective flowing with little speed as e.g. at the turning of the tide

From slack + -er; compare especially slack off.

That’s where the slackers live. — A farewell to arms, Ernest Hemingway
"You wouldn't have me a slacker, mother? — Rilla of Ingleside, L. M. (Lucy Maud) Montgomery
Well, you are a set of slackers! — The Jolliest School of All, Angela Brazil

shirker

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