Definitions

1. adjective

crazy or eccentric in a silly or amusing way

“The daffy character in the comedy sketch made everyone laugh.”

2. adjective

unusually enthusiastic or energetic

“The daffy fan was jumping up and down in the crowd.”

3. adjective

slightly or completely insane, as in the case of a madman

“The daffy villain was plotting to take over the world.”

4. adverb

in a silly or eccentric manner

“He acted daffy, as if he had just seen a ghost.”

5. noun

a type of duck, especially the American golden-eye duck

“The daffy birds were swimming in the lake.”