Learn the definition, synonyms, antonyms, and usage of the adjective grateful , which means showing or expressing thanks, especially to another person. See examples from the Cambridge English Corpus and translations in other languages. Definition of grateful adjective in Oxford Advanced American Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. GRATEFUL meaning : 1. showing or expressing thanks, especially to another person: 2. showing or expressing thanks…. Learn more. Grateful definition : warmly or deeply appreciative of kindness or benefits received; thankful.. See examples of GRATEFUL used in a sentence.