inanition vs slackness

inanition and slackness both are nouns.

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

As nouns, inanition and slackness are synonyms defined as:

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

Other synonyms of inanition include lassitude, lethargy.

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