Synonyms for unable Found 3 synonyms across 2 meanings for “unable”. (usually followed by `to') lacking necessary physical or mental ability (adj) unable(p) lacking in power or forcefulness (adj) ineffectiveineffectual Explore Related Words Rhymes with unableSynonyms for unable(p)Synonyms for ineffectiveSynonyms for ineffectual Synonym Finder | Rhyme Finder | Poetry Editor