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| Celerity | speed |
| Censorious | disapproving; critical |
| Censure | blame |
| Cerebral | intellectual |
| Certitude | certainty |
| Charlatan | trickster who claims knowledge he doesn't have |
| Chary | wary of; cautious about; reluctant to give |
| Chastises | punishes |
| Chicanery | trickery |
| Chimerical | changeable; unstable |
| Choleric | easily angered |
| Chronicler | person who records historical information |
| Circuitous | indirect |
| Circumlocution | using too many words; long-windedness |
| Circumscribe | limit |
| Circumspect | cautious; considering all sides |
| Circumvent | avoid |
| Clairvoyant | psychic; mystic |
| Clamor | shout; scream |
| Clandestine | secret; covert; stealthy |