1. A person affected by insanity. Lunatic asylum, a place for the insane.

2. Affected by lunacy.

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

• ponatic,
• loonatic,
• genatic,
• lunitic,
• lunuti,
• lunitics,
• lunetic,
• luniatic,
• latic,
• fenatic,
• lunatick,
• luntic,
• finatic,
• ennatic,
• lunarie,
• lunatid,
• lunattic,
• lunaticc,
• lunastion,
• alenchtic

The adjective form of the word "lunatic" is "lunatic".

The plural of the "lunatic" can be the "lunatics".

The singular of the "lunatic" can be the "lunatic".