Origin: 1590–1600; < L
languidus faint.
See languish, -id 4 
Related forms: lan⋅guid⋅ly, adverb
lan⋅guid⋅ness, noun
Synonyms:
1. inactive, inert, sluggish, torpid. 2. spiritless. 3. weak, feeble, weary, exhausted, debilitated.
Antonyms:
1. active, energetic. 3. vigorous.