Lethargic is a word that means tired, lazy sluggish, so antonyms of lethargic would be energetic and active.
There are no perfect rhymes for the word sluggish.
No, the word sluggish is an adjective. The adverb form is "sluggishly."
I feel so sluggish all the time. :(
A synonym for the word "sluggish" is "lethargic" or "listless."
The word sluggish means:Displaying little movement or activity; slow; inactive: a sluggish stream; sluggish growth.Lacking alertness, vigor, or energy; inert or indolent.Slow to perform or respond to stimulation.
The word "slug" is related to the word "sluggish", which is probably of Scandinavian origin. There are similar words meaning "sluggish" or "sluggard" in dialects of Norwegian and Swedish.