Source : Webster's Revised Unabridged Dictionary (1913)

Unco \Un"co\, a. [Scot. The same word as E. uncouth.]
   Unknown; strange, or foreign; unusual, or surprising; distant
   in manner; reserved. [Scot.]

Unco \Un"co\, adv.
   In a high degree; to a great extent; greatly; very. [Prov.
   Eng. & Scot.]

Unco \Un"co\, n.
   A strange thing or person. [Scot.]

Source : WordNet®

unco
     adj : beyond what is natural; "his uncanny sense of direction";
           (`unco' is chiefly Scottish) [syn: {uncanny}]

unco
     adv : to a remarkably degree or extent; "she was unusually tall"
           [syn: {unusually}, {remarkably}, {outstandingly}] [ant:
            {normally}]