Princeton's WordNet

1. peaky, spiky(adj)

   having or as if having especially high-pitched spots

   "absence of peaky highs and beefed-up bass"

Wiktionary

1. peaky(Adjective)

   Sickly; peaked.

2. peaky(Adjective)

   Characterised by peaks.

Webster Dictionary

1. Peaky(adj)

   having a peak or peaks

2. Peaky(adj)

   sickly; peaked

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