| conflagration | A large and destructive fire that causes a lot of damage | |
| conflate | To combine or blend together to form one substance or mass | |
| confound | Cause surprise or confusion in (someone), especially by acting against their expectations | |
| conglomerate | A company that is made up of a number of different, often unrelated businesses | |
| conniving | Given to or involved in conspiring to do something immoral, illegal, or harmful | |
| connoisseur | An expert judge in matters of taste | |
| conscientious | Wishing to do one's work or duty well and thoroughly | |
| conspicuous | Standing out so as to be clearly visible | |
| consternation | Feelings of anxiety or dismay, typically at something unexpected | |
| contumacious | Stubbornly or willfully disobedient to authority | |