Etymology
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sluggish (adj.)

mid-15c., from Middle English slugge "lazy person" (see sluggard) + -ish. Earlier adjective was sluggi (early 13c.). Related: Sluggishly; sluggishness.

updated on October 13, 2013

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Definitions of sluggish from WordNet

sluggish (adj.)
moving slowly;
a sluggish stream
Synonyms: sulky
sluggish (adj.)
(of business) not active or brisk;
a sluggish market
Synonyms: dull / slow
sluggish (adj.)
slow and apathetic;
a sluggish worker
Synonyms: inert / soggy / torpid
From wordnet.princeton.edu, not affiliated with etymonline.