Did you perhaps mean fastly?
- From Middle English festlich, equivalent to feast + -ly. Cognate with Dutch feestelijk ("festive"), German festlich ("festive, solemn"), Danish and Swedish festlig ("festive, solemn"). (Wiktionary)
“Dara insisted that their Samaritan act should be repaid with a feastly dinner.”
These user-created lists contain the word ‘feastly’.
List of adjectives such as everduring that do not frequent common speech and writing. A continuation of my list Adjectival Arcana, which had grown to over 7700 words and had become far too cumbersome.
Looking for tweets for feastly.