informal /in-förˈməl/

1. Not of a formal or conventional nature
2. Characterized by lack of ceremony or formality
3. Relaxed, friendly, unceremonious
4. (esp of clothes) appropriate to everyday or casual use
5. (of speech or writing) having vocabulary, idiom, etc characteristic of conversational speech
6. (of a vote) invalid (Aust and NZ)

• cataloes
• catalog
• cataloged
• cataloger
• catalogers
• cataloging
• calling cards
• calling-crab
• calling-crabs
• callings
• call in on
• call in question
• call into play
• call into question
• Calliope
• Calliopes
• calliper
• calliper-compasses
• callipered
• callipering
• callipers
• calliper splint
• calliper splints
• Callippic Period
• callipygean