| Cache | Store, Hoard, Reserve, Stockpile |
| Caliber | Merit, Ability, Capacity, Talent, Size |
| Callous | Insensible, Indifferent, Uncaring, Apathetic |
| Candid | Frank, Sincere, Truthful, Straightforward |
| Caricature | Cartoon, Imitation |
| Castigate | Punish, Chastise, Penalize, Discipline |
| Cajole | Coax, Persuade, Beguile |
| Calamity | Disaster, Catastrophe, Tragedy, Hardship |
| Camouflage | Disguise, Mask, Cloak, Veil, Misrepresent |
| Capitulate | Surrender, Yield, Succumb, Concede |
| Cardinal | Important, Chief, Principal, Essential |
| Cease | Desist, Stop |
| Chaos | Disorder, Confusion, Pandemonium, Bedlam |
| Chaste | Pure, Undefiled, Clean |
| Circumvent | Avoid, Go Around |
| Clinch | Secure, Confirm, Conclude |
| Clumsy | Awkward, Ungraceful, Unskillful, Inept |
| Coherent | Orderly, Consistent, Organized, Reasonable, Rational |
| Colossal | Huge, Gigantic, Massive, Immense |
| Commemorate | Celebrate, Honor |
| Conspicuous | Obvious, Evident, Apparent, Clear |
| Conceive | Design, Plan |
| Contemptuous | Sneering, Scornful, Insulting, Insolent |
| Conscientious | Fair, Moral, Upright, Righteous, Scrupulous |
| Credulous | Confident, Trustful |
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