a. | 1. | Pertaining to, affected with, or resembling, lethargy; morbidly drowsy; dull; heavy. |
Adj. | 1. | lethargic - deficient in alertness or activity; "bullfrogs became lethargic with the first cold nights" Synonyms: unergetic Antonyms: energetic - possessing or exerting or displaying energy; "an energetic fund raiser for the college"; "an energetic group of hikers" |