| Text | Length |
| Not feel well | 13 |
| Not feeling perfect | 19 |
| Not feeling so hot | 18 |
| Not feeling up ___ | 18 |
| Not feeling well | 16 |
| Not fem. or masc. | 17 |
| Not fem. or neut. | 17 |
| Not feminine: Abbr. | 19 |
| Not feverish | 12 |
| Not fictitious | 14 |
| Not field cleanly | 17 |
| Not fighting | 12 |
| Not fighting it | 15 |
| Not figurative | 14 |
| Not filled up | 13 |
| Not filleted | 12 |
| Not final, at law | 17 |
| Not final, in law | 17 |
| Not final, legally | 18 |
| Not final, ln law | 17 |
| Not findable | 12 |
| Not fine-grained | 16 |
| Not finished | 12 |
| Not finished yet | 16 |
| Not fireproof | 13 |
| Not firm work? | 14 |
| Not firmly fixed | 16 |
| Not first-qual. | 15 |
| Not firsthand | 13 |
| Not fit for market | 18 |
| Not fit for passing | 19 |
| Not fit to be eaten | 19 |
| Not fit to drive | 16 |
| Not fit to gobble | 17 |
| Not fit to serve | 16 |
| Not fizzle out | 14 |
| Not flat at all | 15 |
| Not flat or sharp | 17 |
| Not flat, as hair | 17 |
| Not flat, in a way | 18 |
| Not flat, say | 13 |
| Not fleshed out | 15 |
| Not flexible | 12 |
| Not flippant | 12 |
| Not flowing freely | 18 |
| Not flush at all | 16 |
| Not flustered | 13 |
| Not foggy-headed | 16 |
| Not follow the book | 19 |
| Not followed | 12 |
| Not following | 13 |
| Not fool around | 15 |
| Not fooled by | 13 |
| Not for a Scot | 14 |
| Not for all eyes | 16 |
| Not for boys only | 17 |
| Not for children | 16 |
| Not for degustation | 19 |
| Not for everyone | 16 |
| Not for free | 12 |
| Not for here | 12 |
| Not for kiddies | 15 |
| Not for kids | 12 |
| Not for little ones | 19 |
| Not for Luddites | 16 |
| Not for minors | 14 |
| Not for most teens | 18 |
| Not for neatniks | 16 |
| Not for nothing | 15 |
| Not for prudes | 14 |
| Not for real | 12 |
| Not for sure | 12 |
| Not for tender eyes | 19 |
| Not for the masses | 18 |
| Not for the outside | 19 |
| Not for the prudish | 19 |
| Not for the public | 18 |
| Not for the summit? | 19 |
| Not for tots | 12 |
| Not for tweens, say | 19 |
| Not for young eyes | 18 |
| Not for: Abbr. | 14 |
| Not forbidden | 13 |
| Not foreordained | 16 |
| Not forgetting | 14 |
| Not forgotten | 13 |
| Not forsaking | 13 |
| Not forthcoming | 15 |
| Not forthright | 14 |
| Not forthwith | 13 |
| Not fractional | 14 |
| Not free on board | 17 |
| Not free to go | 14 |
| Not freelance | 13 |
| Not freelancing | 15 |
| Not fresh, as water | 19 |
| Not fresh, in a way | 19 |
| Not fresh-squeezed | 18 |
| Not freshly made | 16 |
| Not friendly | 12 |
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