Source : Webster's Revised Unabridged Dictionary (1913)

Buffoonish \Buf*foon"ish\, a.
   Like a buffoon; consisting in low jests or gestures. --Blair.

Source : WordNet®

buffoonish
     adj : like a clown; "a buffoonish walk"; "a clownish face"; "a
           zany sense of humor" [syn: {clownish}, {clowlike}, {zany}]