Entry 1 sense Webster, 1913 Bullish /bo͝ol'-ĭsh/ · Bull·ish · IPA /ˈbʊlɪʃ/ 01 a. Partaking of the nature of a bull, or a blunder. 1. 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.