Synonyms for thin Found 16 synonyms across 7 meanings for “thin”. lessen the strength or flavor of a solution or mixture (verb) dilutereducecut take off weight (verb) slimslenderize lacking excess flesh (adj) lean very narrow (adj) slender not dense (adj) sparse lacking substance or significance (adj) flimsyfragileslighttenuous without viscosity (adv) thinly Explore Related Words Rhymes with thinSynonyms for diluteSynonyms for reduceSynonyms for cutSynonyms for slimSynonyms for slenderize Synonym Finder | Rhyme Finder | Poetry Editor