| Term | Definition |
| contraband (n) | anything that is against the law to buy or sell |
| contradict (v) | to express the opposite |
| contrarian (n) | a person who thinks differently from other people; a person who does the opposite of what is expected |
| contrary (adj) | completely different; opposite in nature, opinion, or action |
| contrast (v) | to look at different things to see how they are opposites or not related |
| counterbalance (n) | a weight used to balance an opposite weight |
| counterclockwise (adv) | in the direction that is opposite of the direction the hands on the clock move |
| counterexample (n) | an example used to support a claim or statement that is the opposite of another claim or statement |
| counterfeit (adj) | being the opposite of real; fake or artificial |
| counterintuitive (adj) | goes against your gut feeling or common sense |
| contra, counter | against, opposite |