1. Without advance planning
   "they met accidentally"
   - by chance, circumstantially, unexpectedly 
2. Of a minor or subordinate nature
   - incidentally 
3. Without intention; in an unintentional manner
   - unintentionally

See also: accidental

Antonym: deliberately

Encyclopedia: Accidentally

• self-conscious
• self-consciously
• self-consciousness
• self-consistent
• self-constituted
• self-contained
• self-contemplation
• self-contempt
• self-contradiction
• self-contradictory
• self-control
• self-controlled
• self-criticism
• self-cultivation
• floosie
• floozie
• floozy
• flop
• flophouse
• floppiness
• floppy
• floppy disk
• flora
• floral
• floral arrangement