inanition n. + Add to list ina·ni·tion SynonymsEtymology Synonyms lassitudelethargyslacknessOriginLA-LATinānītio→OFRinanition→MEinanicioun→ENinanition From Middle English inanicioun, borrowed from Old French inanition, itself borrowed from Late Latin inānītio, from inānīre (“to make empty”), from inānis (“empty, vain”); see inane.