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Adjective: peaky (peakier,peakiest)  pee-kee
  1. Having or as if having especially high-pitched spots
    "absence of peaky highs and beefed-up bass";
    - spiky
  2. [Brit, informal] Unhealthy looking
    - sallow, sickly
  3. Having or resembling peaks

Derived forms: peakiest, peakier

See also: high, high-pitched, unhealthy