| 100% | WHATADEAL | 9 | "I can't afford NOT to buy it!" |
| 57% | OLEO | 4 | I Can't Believe It's Not Butter! product |
| 57% | TITANIC | 7 | I can’t - it turned out to be vast |
| 56% | SPREAD | 6 | I Can't Believe It's Not Butter, e.g. |
| 54% | FABIO | 5 | Onetime spokesmodel for I Can't Believe It's Not Butter |
| 53% | FABIO | 5 | Former spokes-hunk for I Can't Believe It's Not Butter |
| 49% | OLEO | 4 | "I Can't Believe It's Not Butter" |
| 49% | OMG | 3 | "I can't believe it!" to a texter: Abbr. |
| 48% | AMNESIA | 7 | Problem that crossword constructors can't afford to have, if I remember rightly |
| 48% | ARE | 3 | It can follow you but not me? |
| 47% | ITS | 3 | I Can't Believe ___ Not Butter! |
| 46% | IFORGET | 7 | "Hmmm, it's not coming to me" |
| 46% | RENTAL | 6 | I'm not buying it! |
| 44% | UNABLE | 6 | Can't do it, not possible |
| 43% | SATANIC | 7 | I can’t, as it turns devilish |
| 43% | HELP | 4 | "Not if I can ___ it!" |
| 43% | LALALA | 6 | "___, I can't hear you" ("I'm not listening ..."): 3 wds. |
| 43% | EVEN | 4 | "I can't ___" ("It's too much to process") |
| 43% | MOI | 3 | "Surely you can't think I did it?" |
| 42% | MRDARCY | 7 | To whom it is said, “I had not known you a month before I felt that you were the last man in the world whom I could ever be prevailed on to marry” |
| 42% | NEAR | 4 | "As ___ as I can tell ..." ("It seems to me ...") |
| 42% | MONEY | 5 | It can't buy love, in song |
| 42% | IREFUSE | 7 | "You can't make me do it!" |
| 42% | IMAWARE | 7 | "It's not news to me ... " |
| 42% | IFORGET | 7 | "It's not coming to me" |
| 42% | ICANTTELL | 9 | "It's not clear to me" |
| 42% | DONE | 4 | "I couldn't have ___ it without you," expression that you could use to thank someone |
| 42% | YOGA | 4 | "Would it be a stretch to say I dig your ___ T-shirt?," Ava asked. |
| 41% | CURSESFOULEDAGAIN | 17 | "Damn, I can't seem to get a ball into fair territory!"? |
| 41% | OHNO | 4 | "I can't believe this is happening to me!": 2 wds. |