| Not concurring | 14 |
| Not concrete | 12 |
| Not concerted | 13 |
| Not concerned with right or wrong | 33 |
| Not concerned with right and wrong | 34 |
| Not concerned with morality | 27 |
| Not concerned | 13 |
| Not concealed | 13 |
| Not conceal, with "up" | 32 |
| Not conceal | 11 |
| Not con | 7 |
| Not compromised | 15 |
| Not comprehending at all | 24 |
| Not complicated | 15 |
| Not completely white anymore | 28 |
| Not completely shut, as a door | 30 |
| Not completely shut | 19 |
| Not completely settle an argument [New York] | 44 |
| Not completely round | 20 |
| Not completely formed | 21 |
| Not completely dissolved, as a drink mix | 40 |
| Not completely dark, maybe | 26 |
| Not completely closed | 21 |
| Not completely clean | 20 |
| Not completely | 14 |
| Not completed, as obligations | 29 |
| Not complaining | 15 |
| Not competent in | 16 |
| Not competent | 13 |
| Not communicate clearly | 23 |
| Not commonplace | 15 |
| Not commonly known | 18 |
| Not common | 10 |
| Not committed to a pol. party | 29 |
| Not commit | 10 |
| Not commissioned, after "on" | 38 |
| Not commercial | 14 |
| Not coming up short | 19 |
| Not coming back | 15 |
| Not comfortable with | 20 |
| Not come unglued? | 17 |
| Not come through in the clutch | 30 |
| Not come in first | 17 |
| Not come anywhere near the target | 33 |
| Not colorful | 12 |
| 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 |