adj. (old: now colloquial).Shrewd; far-seeing; clever. Also LONG-HEADEDNESS.
c. 1696. B. E., A New Dictionary of the Canting Crew, s.v.
1711. Spectator, No. 52. But being a LONG-HEADED gentlewoman, I am apt to imagine she has some further design than you have yet penetrated.
1725. A New Canting Dictionary, s.v.
1840. DICKENS, The Old Curiosity Shop, lxvi. Many distinguished characters, called men of the world, LONG-HEADED customers, knowing dogs, shrewd fellows.
1871. J. R. LOWELL, My Study Windows, 126. Ulysses was the type of LONG-HEADEDNESS.