Webster's Revised Unabridged Dictionary · 1913

Unco

Unco , adjective

[Scot. The same word as English uncouth.]

Unknown; strange, or foreign; unusual, or surprising; distant in manner; reserved. [Scottish]

Unco , adverb

In a high degree; to a great extent; greatly; very. [Provincial English & Scottish]

Unco , noun

A strange thing or person. [Scottish]