Green’s Dictionary of Slang

(US) superior, notable.

1841		Spirit of the Times (N.Y.) 27 Mar. 43/3: In bar hunts I am numerous [DA].
1860		J.G. Holland Miss Gilbert’s Career (1870) 121: He sort o’ stands round, and spreads, and lets off all the big talk he hears. Ain’t he rather numerous, though?