thankfulEnglishOxford English Thesaurusthankful adjective 1 Merrill closed the door, thankful that the evening was over: relieved, pleased, glad, grateful. ▷antonyms disappointed. 2 he was really thankful to her for coming to his aid: grateful, filled with gratitude, indebted, obliged, under an obligation, obligated, beholden. ▷antonyms ungrateful.choose the right word thankful, grateful, appreciativeSee grateful.thankful Oxford Dictionary of English