Synonyms for il Found 6 synonyms across 2 meanings for “il”. a midwestern state in north-central United States (noun) illinoisill. being nine more than forty (adj) forty-nine49 Explore Related Words Rhymes with ilSynonyms for illinoisSynonyms for ill.Synonyms for forty-nineSynonyms for 49 Synonym Finder | Rhyme Finder | Poetry Editor