Etymology
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thankful (adj.)

Old English þancful "satisfied, grateful," also "thoughtful, ingenious, clever;" see thank + -ful. Related: Thankfully; thankfulness. Thankfully in the sense "thankful to say" is attested by 1966, but deplored by purists (compare hopefully).

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Definitions of thankful

thankful (adj.)
feeling or showing gratitude;
a thankful smile
Synonyms: grateful
From wordnet.princeton.edu