Slacker

wiktionary

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From slack +‎ -er; compare especially slack off.

etymonline

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slacker (n.)

popularized 1994, but the meaning "person who shirks work" dates to 1897; agent noun from slack (v.). In early use also slackster (1901). Compare Old English sleacornes "laziness," which is not, however, an agent noun. Related: Slackerly; slackerish.