LETHARGIC
lethargic, unenergetic
(adjective) deficient in alertness or activity; “bullfrogs became lethargic with the first cold nights”
Source: WordNet® 3.1
Etymology
Adjective
lethargic (comparative more lethargic, superlative most lethargic)
sluggish, slow
indifferent, apathetic
Synonyms
• torpid
• lazy
• unmoving
Source: Wiktionary
Le*thar"gic, Le*thar"gic*al, a. Etym: [L. lethargicus, Gr.
léthargique. See Lethargy.]
Definition: Pertaining to, affected with, or resembling, lethargy; morbidly
drowsy; dull; heavy.
– Le*thar"gic*al*ly, v.
– Le*thar"gic*al*ness, n.
– Le*thar"gic*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition