gratuitous ɡrəˈtjuːɪtəs/ adjective adjective: gratuitous 1. done without good reason; uncalled for. “gratuitous violence” synonyms: unjustified, without reason, uncalled for, unwarranted, unprovoked, undue; More antonyms: justifiable, necessary 2. given or done free of charge. “solicitors provide a form of gratuitous legal advice” synonyms: free, gratis, complimentary, voluntary, volunteer, unpaid, unrewarded, unsalaried, free of charge, without charge, for nothing, at no cost, without payment; More antonyms: paid, professional