1. Having peaks; like a peak.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• yecky,
• pealy,
• persky,
• speakk,
• reakky,
• speakw,
• reaky,
• peack,
• earky,
• peekay,
• cheaky,
• pseak,
• peskey,
• repky,
• perkey,
• percky,
• nearky,
• speaky,
• peark,
• preay

• pes,
• Peggy,
• peachy,
• peek,
• peake,
• pesewa,
• pesah,
• pekoe,
• peg,
• peck,
• peak,
• peaks,
• peke,
• pesky.

The adjective form of the word "peaky" is "peakish".

The plural form of the word "peaky" is "peakies".

The singular form of the word "peaky" is "peaky" itself. "Peak" is a noun on its own but does not have the same meaning as "peaky".