1. Totally unlikely
   - impossible, inconceivable, unimaginable

See also: unthinkable

• self-centred
• self-centredness
• self-collected
• self-colored
• self-coloured
• self-command
• self-complacency
• self-complacent
• self-conceit
• self-conceited
• self-conceitedly
• self-concern
• self-condemnation
• self-confessed
• self-confidence
• self-confident
• self-confidently
• self-congratulation
• self-congratulatory
• self-conscious
• self-consciously
• self-consciousness
• self-consistent
• self-constituted
• self-contained