1. An insane person
   - lunatic, madman 
2. A person who has an obsession with or excessive enthusiasm for something

1. Wildly disordered
   - maniacal

Derived forms: maniacs

See also: insane

Type of: diseased person, enthusiast, fancier, sick person, sufferer

Encyclopedia: Maniac

• into
• into the bargain
• into the wind
• intolerable
• intolerably
• intolerance
• intolerant
• intolerantly
• intonate
• intonation
• intonation pattern
• intone
• intoned
• intoner
• intoxicant
• intoxicate
• intoxicated
• intoxicating
• intoxication
• intra vires
• intra-
• intrabronchial
• intracapsular surgery
• intracellular
• intracellular fluid