| Text | Length |
| Not colored, as hair | 20 |
| Not colored naturally | 21 |
| Not colored | 11 |
| Not collectively | 16 |
| Not collected at all | 20 |
| Not coincidental | 16 |
| Not cognizant | 13 |
| Not COD | 7 |
| Not coasting along | 18 |
| Not coastal | 11 |
| Not coarse | 10 |
| Not cluttered | 13 |
| Not clueless about | 18 |
| Not clueless | 12 |
| Not cloudy: Abbr. | 17 |
| Not cloudy | 10 |
| Not clothed | 11 |
| Not closeted | 12 |
| Not closed, in verse | 20 |
| Not closed, in poetry | 21 |
| Not closed fully | 16 |
| Not closed all the way | 22 |
| Not closed | 10 |
| Not close-minded about | 22 |
| Not close, once | 15 |
| Not close gently | 16 |
| Not close enough | 16 |
| Not close by | 12 |
| Not close at hand | 17 |
| Not close | 9 |
| Not clocked in | 14 |
| Not Clinton's favorite lawyer | 33 |
| Not clichéd | 14 |
| Not clerical | 12 |
| Not cleric | 10 |
| Not clergy | 10 |
| Not clergical | 13 |
| Not clearly visible | 19 |
| Not clearly expressed | 21 |
| Not clear-cut | 13 |
| Not clear, in a way | 19 |
| Not clear to most | 17 |
| Not clear | 9 |
| Not cleaned | 11 |
| Not clean-shaven | 16 |
| Not clean, as a garment | 23 |
| Not clean as a whistle | 22 |
| Not clean | 9 |
| Not classified | 14 |
| Not classical | 13 |
| Not clashing | 12 |
| Not clandestine | 15 |
| Not civ. | 8 |
| Not chunky, as peanut butter | 28 |
| Not chug | 8 |
| Not chronic, medically | 22 |
| Not chronic, as illness | 23 |
| Not chronic | 11 |
| Not chosen | 10 |
| Not choppy | 10 |
| Not chilling | 12 |
| Not chic | 8 |
| Not checks or credit | 20 |
| Not checking to make sure | 25 |
| Not checked for speed | 21 |
| Not check or charge | 19 |
| Not check | 9 |
| Not cheating on one's sexual partner | 40 |
| Not cheating on | 15 |
| Not cheating | 12 |
| Not cheat | 9 |
| Not cheap | 9 |
| Not chatty | 10 |
| Not charging for | 16 |
| Not characteristic of | 21 |
| Not changing | 12 |
| Not change course | 17 |
| Not change | 10 |
| Not challenging | 15 |
| Not challenge | 13 |
| Not certifiable? | 16 |
| Not certifiable, so to speak | 28 |
| Not certifiable | 15 |
| Not certain at all | 18 |
| Not certain | 11 |
| Not cerebral | 12 |
| Not centered | 12 |
| Not censored, say | 17 |
| Not censored | 12 |
| Not celebrated, as a hero | 25 |
| Not celebrated | 14 |
| Not cede the point | 18 |
| Not causing infection | 21 |
| Not caught up | 13 |
| Not caught napping | 18 |
| Not caught | 10 |
| Not catch | 9 |
| Not casual | 10 |
| Not cash: Abbr. | 15 |
| Not carrying anything illegal | 29 |
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