Lack of Energy, Sluggishness
Puzzle 4 of Animals with Weird Names Hard Pack
Question is: Lack of Energy, Sluggishness
and the answer is: LETHARGY
Word Meaning:
LETHARGY — A state of extreme torpor, sopor or apathy, especially with lack of emotion, energy or enthusiasm; (loosely) sluggishness, laziness.
Definitions from Wiktionary.