Source : Webster's Revised Unabridged Dictionary (1913)

Peaky \Peak"y\, a.
   1. Having a peak or peaks. --Tennyson.

   2. Sickly; peaked. [Colloq.]

Source : WordNet®

peaky
     adj : having or as if having especially high-pitched spots;
           "absence of peaky highs and beefed-up bass" [syn: {spiky}]