| Text | Length |
| Not freelance | 13 |
| Not free to go | 14 |
| Not free on board | 17 |
| Not free | 8 |
| Not fractional | 14 |
| Not found on rolling stones | 27 |
| Not found in many stamp collections, say | 40 |
| Not found | 9 |
| Not foul | 8 |
| Not forward, to a salt | 22 |
| Not forward, to a sailor | 24 |
| Not forward | 11 |
| Not forthwith | 13 |
| Not forthright | 14 |
| Not forthcoming | 15 |
| Not forsaking | 13 |
| Not forming an angle | 20 |
| Not formal | 10 |
| Not forgotten | 13 |
| Not forgetting | 14 |
| Not forget | 10 |
| Not foreordained | 16 |
| Not foreign, as policy | 22 |
| Not foreign | 11 |
| Not fore | 8 |
| Not forced | 10 |
| Not forbidden | 13 |
| Not for: Abbr. | 14 |
| Not for young eyes | 18 |
| Not for young children | 22 |
| Not for tweens, say | 19 |
| Not for tots | 12 |
| Not for the thin-skinned | 24 |
| Not for the summit? | 19 |
| Not for the squeamish | 21 |
| Not for the scrap heap | 22 |
| Not for the public | 18 |
| Not for the prudish | 19 |
| Not for the Parti Québécois? | 34 |
| Not for the outside | 19 |
| Not for the masses | 18 |
| Not for the general public | 26 |
| Not for the first time | 22 |
| Not for the faint of heart | 26 |
| Not for tender eyes | 19 |
| Not for sure | 12 |
| Not for straight arrows | 23 |
| Not for real | 12 |
| Not for prudes | 14 |
| Not for one time only | 21 |
| Not for nothing | 15 |
| Not for neatniks | 16 |
| Not for most teens | 18 |
| Not for minors | 14 |
| Not for Luddites | 16 |
| 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 |
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