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"thankful" is also used as a crossword clue. If that's what you saw, the answer is often grateful (8 letters).
Definitions
feeling or showing gratitude
Word origin
From Middle English thankful, from Old English þancful, þancfull (“thoughtful, pleasing, agreeable, pleasant, thankful, grateful”), equivalent to thank + -ful. Compare Old High German undankfol (“unthankful, ungrateful”).
Used in a sentence
“I'm thankful that you helped me out today. How can I ever repay you?”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Appreciative”8 letters
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