Source : Webster's Revised Unabridged Dictionary (1913)

Bullish \Bull"ish\, a.
   Partaking of the nature of a bull, or a blunder.

         Let me inform you, a toothless satire is as improper as
         a toothed sleek stone, and as bullish.   --Milton.

Source : WordNet®

bullish
     adj : expecting a rise in prices