adj. (old: now recognised).1. See quot.
c. 1696. B. E., A New Dictionary of the Canting Crew, s.v. HEADY, strong Liquors that immediately fly up into the Noddle, and so quickly make Drunk.
2. (colloquial).Restive; full of arrogance and airs; opinionated.
1864. National Review, p. 535. I think its the novels that make my girls so HEADY.