1. Not formal
   "conservative people unaccustomed to informal dress"; "an informal free-and-easy manner"; "an informal gathering of friends" 
2. Not officially recognized or controlled
   "an informal agreement"
   - loose 
3. Used of spoken and written language 
4. Having or fostering a warm or friendly and informal atmosphere
   "a relaxed informal manner"
   - cozy [N. Amer], intimate, cosy [Brit, Cdn]

See also: casual, colloquial, common, conversational, daily, epistolary, epistolatory, everyday, folksy, formality, formalness, free-and-easy, friendly, informality, informally, nonliterary, slangy, subliterary, unceremonial, unceremonious, unliterary, unofficial, unrhetorical, vernacular, vulgar

Antonym: formal

Encyclopedia: Informal

• eagle ray
• Eagle Scout
• eagle-eyed
• eaglet
• eagre
• Eames
• Eames chair
• Eamon de Valera
• ear
• ear canal
• ear doctor
• ear fungus
• ear hole
• ear specialist
• ear trumpet
• ear-like
• ear-nose-and-throat doctor
• ear-shaped
• ear-shell
• earache
• eardrop
• eardrum
• eared
• eared grebe
• eared seal