| coddle | Treat in an indulgent or overprotective way | |
| coeval | Having the same age or date of origin; contemporary. | |
| cognizant | Having knowledge or being aware of | |
| coherence | The quality of being logical and consistent | |
| cohesive | Condition of sticking together | |
| cohort | A group of people banded together or treated as a group | |
| collusion | Secret or illegal cooperation or conspiracy, especially in order to cheat or deceive others | |
| commensurate | Corresponding in size, extent, amount, or degree; proportionate | |
| commiserate | To feel or express sympathy or compassion | |
| complicit | Involved with others in an illegal activity or wrongdoing | |