1. Without formality
   "he visited us informally" 
2. With the use of colloquial expressions
   - colloquially, conversationally

See also: informal

Antonym: formally

• red sanders
• red sanderswood
• red saunders
• red scare
• Red Sea
• red setter
• red shrubby penstemon
• red silk cotton
• red silk-cotton tree
• red silver fir
• red siskin
• red snapper
• red sorrel
• red spider
• red spider mite
• red sprites
• honorable discharge
• honorable mention
• honorableness
• honorably
• honorarium
• honorary
• honorary degree
• honorary society
• Honore Balzac