Synonyms for blacken Found 6 synonyms across 2 meanings for “blacken”. make or become black (verb) melanizemelaniseblack burn slightly and superficially so as to affect color (verb) charsearscorch Explore Related Words Rhymes with blackenSynonyms for melanizeSynonyms for melaniseSynonyms for blackSynonyms for charSynonyms for sear Synonym Finder | Rhyme Finder | Poetry Editor