slacker[noun]Synonyms: layabout, dodger, idler, loafer, shirker, skiver 
(Brit. slang) 
Related Words: idler, 
loafer, 
slugabed, 
sluggard [TahlilGaran] English Synonym Dictionary ▲
 slack‧er /ˈslækə $ -ər/ 
 noun [countable] informal someone who is lazy and does not do all the work they should – used to show disapproval 
 [TahlilGaran] Dictionary of Contemporary English ▲