leanness n. + Add to list UK //lˈiːnnəs// lean·ness SynonymsAntonymsEtymology Synonyms exiguitymeagernessmeagrenesspoornessscantinessscantnesssparenessthinness Antonyms fatnessOriginMElenenesse→ENleanness From Middle English lenenesse, equivalent to lean + -ness.