slackness vs inanition

slackness and inanition both are nouns.

Word	Noun	Adjective	Verb	Adverb
slackness	Yes	No	No	No
inanition	Yes	No	No	No

As nouns, slackness and inanition are synonyms defined as:

slackness and inanition: weakness characterized by a lack of vitality or energy

Other synonyms of slackness include lassitude, lethargy.

slackness (noun)	inanition (noun)
the quality of being loose (not taut)	exhaustion resulting from lack of food
the quality of being lax and neglectful	weakness characterized by a lack of vitality or energy
weakness characterized by a lack of vitality or energy