| Clue | Source | Date |
|---|---|---|
| '__ isn't!': emphatic rebuttal | The Washington Post | 22 Dec 2019 |
| "__ isn't!": emphatic rebuttal | LA Times Daily | 22 Dec 2019 |
| "___ is not!" (playground retort) | ||
| "___ isn't!" (phrase of denial) | ||
| With 38-down, argumentative phrase | ||
| "___ can't be!" | ||
| "___ cannot be!" | ||
| "___isn't!" |