adj. (colloquial).—Shrewd; intelligent; vain.
1853. BULWER-LYTTON, My Novel, bk. IV., ch. xii. LANDLORD (doggedly).—There’s gumption and GUMPTIOUS! Gumption is knowing; but when I say that sum un is GUMPTIOUS, I mean—though that’s more vulgar like—sum un who does not think small beer of hisself. You take me, sir?
