Amusingly, the Orwell piece itself mentions a particularly stupid sub-species of the "not X"; namely, the "not un-X" (e.g. "not untall" instead of just "tall").

Amusingly, the Orwell piece itself mentions a particularly stupid sub-species of the "not X"; namely, the "not un-X" (e.g. "not untall" instead of just "tall"). In a footnote he says: "One can cure oneself of the not un- formation by memorizing this sentence: A not unblack dog was chasing a not unsmall rabbit across a not ungreen field."