| Text | Length |
| Not flat, in a way | 18 |
| Not flat, as terrain | 20 |
| Not flat, as hair | 17 |
| Not flat, as bedsheets | 22 |
| Not flat or sharp | 17 |
| Not flat at all | 15 |
| Not flat | 8 |
| Not flashy | 10 |
| Not flaky | 9 |
| Not flaccid | 11 |
| Not flabby | 10 |
| Not fizzle out | 14 |
| Not fizzing | 11 |
| Not fixed in one place | 22 |
| Not fixed | 9 |
| Not fixable | 11 |
| Not fitting the pattern | 23 |
| Not fitting a category, briefly | 31 |
| Not fitting | 11 |
| Not fit to serve | 16 |
| Not fit to gobble | 17 |
| Not fit to eat, in a way | 24 |
| Not fit to drive | 16 |
| Not fit to be eaten | 19 |
| Not fit for passing | 19 |
| Not fit for mixed company | 25 |
| Not fit for market | 18 |
| Not fit for consumption | 23 |
| Not fit | 7 |
| Not firsthand | 13 |
| Not first-qual. | 15 |
| Not first | 9 |
| Not firmly fixed | 16 |
| Not firm, as recently poured concrete | 37 |
| Not firm, as a foundation | 25 |
| Not firm work? | 14 |
| Not firm ground to stand on | 27 |
| Not firing on all cylinders | 27 |
| Not fireproof | 13 |
| Not fired | 9 |
| Not finished yet | 16 |
| Not finished | 12 |
| Not fine-grained | 16 |
| Not fine | 8 |
| Not findable | 12 |
| Not finalized, legally | 22 |
| Not finalized, in law | 21 |
| Not finalized, at law | 21 |
| Not final, ln law | 17 |
| Not final, legally | 18 |
| Not final, in law | 17 |
| Not final, at law | 17 |
| Not final, as a legal decree | 28 |
| Not final, as a decree | 22 |
| Not final or absolute | 21 |
| Not final | 9 |
| Not filmed | 10 |
| Not filleted, as fish | 21 |
| Not filleted | 12 |
| Not filled up | 13 |
| Not fill something all the way, say | 35 |
| Not figurative | 14 |
| Not fighting it | 15 |
| Not fighting | 12 |
| Not field cleanly | 17 |
| Not fictitious | 14 |
| Not fiction | 11 |
| Not fickle | 10 |
| Not feverish | 12 |
| Not fertile | 11 |
| Not feral | 9 |
| Not fer, in Dogpatch | 20 |
| Not fer | 7 |
| Not feminine: Abbr. | 19 |
| Not fem. or neut. | 17 |
| Not fem. or masc. | 17 |
| Not fem. | 8 |
| Not feisty | 10 |
| Not feeling well | 16 |
| Not feeling very creative | 25 |
| Not feeling up ___ | 18 |
| Not feeling too well | 20 |
| Not feeling so hot | 18 |
| Not feeling put out? | 20 |
| Not feeling perfect | 19 |
| Not feeling 100 percent | 23 |
| Not feeling | 11 |
| Not feel well | 13 |
| Not feel so good. | 17 |
| Not feel so good | 16 |
| Not feel oneself | 16 |
| Not feeble | 10 |
| Not fearful | 11 |
| Not fazed by | 12 |
| Not favoring | 12 |
| Not favorably written up | 24 |
| Not faux | 8 |
| Not fatty | 9 |
| Not fated | 9 |
| Not fat, as meat | 16 |
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