ˈrookish,a. [f. rook n.1 + -ish.] Of or pertaining to rooks; resembling a rook. 1738Common Sense II. 120 They seem now to be the Out⁓casts of the Rookish Race.1869Daily News 23 Jan., It gives a rookish look to a corpulent Frenchman, and makes a thin one spectral.