adjective
daffy
DAF-ee/ˈdæfi/
Silly or amusingly eccentric.
His daffy sense of humor keeps us all laughing.

Etymology
Daffe, “a halfwit,” is one possible base, with -y marking a quality; daft is another, and daffe’s own origin is uncertain. Earlier meanings “unintelligent” and “crazy” connect to the milder sense of silliness or eccentricity.
More examples
- She tells a daffy story about a talking refrigerator.
- Wearing a cape to breakfast seems a little daffy.
- Each costume is daffier than the last.
Forms
daffy · daffier · daffiest
daffiness noun — The quality of being amusingly silly.