- sluggish - with little movement; very slow; "a sluggish stream"
Antonym: fast (indirect, via slow)
- dull, slow, sluggish - (of business) not active or brisk; "business is dull (or slow)"; "a sluggish market"
Antonym: active (indirect, via inactive)
- inert, sluggish, torpid - slow and apathetic; "she was fat and inert"; "a sluggish worker"; "a mind grown torpid in old age"
Antonym: active (indirect, via inactive)