lassitude vs inanition

lassitude and inanition both are nouns.

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

As nouns, lassitude and inanition are synonyms defined as:

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

Other synonyms of lassitude include lethargy, slackness.

lassitude (noun)	inanition (noun)
weakness characterized by a lack of vitality or energy	exhaustion resulting from lack of food
a feeling of lack of interest or energy	weakness characterized by a lack of vitality or energy
a state of comatose torpor (as found in sleeping sickness)