| Text | Length |
| Not for little ones | 19 |
| Not for kids, as films | 22 |
| Not for kids | 12 |
| Not for kiddies | 15 |
| Not for here | 12 |
| Not for free | 12 |
| Not for everyone | 16 |
| Not for delicate ears | 21 |
| Not for degustation | 19 |
| Not for children | 16 |
| Not for boys only | 17 |
| Not for all eyes | 16 |
| Not for a Scot | 14 |
| Not for | 7 |
| Not fooling | 11 |
| Not fooled by | 13 |
| Not fooled | 10 |
| Not fool around | 15 |
| Not fond of dirty jokes, surely | 31 |
| Not following at all | 20 |
| Not following | 13 |
| Not followed | 12 |
| Not follow the book | 19 |
| Not follow a fixed route | 24 |
| Not fold | 8 |
| Not foggy-headed | 16 |
| Not focused | 11 |
| Not fly absolutely straight | 27 |
| Not flustered | 13 |
| Not flush with the wall, possibly | 33 |
| Not flush at all | 16 |
| Not flush | 9 |
| Not flunk | 9 |
| Not flowing freely | 18 |
| Not flowery | 11 |
| Not flipped, in a way | 21 |
| Not flippant | 12 |
| Not flimsy | 10 |
| Not flighty | 11 |
| Not flexible, as muscles | 24 |
| Not flexible | 12 |
| Not fleshy | 10 |
| Not fleshed out | 15 |
| Not flee | 8 |
| Not flat, say | 13 |
| 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 |
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