| Clue | Source | Date |
|---|---|---|
| Easy marks for a con man | ||
| Nitwits | New York Times | 30 Apr 2017 |
| Gullible sorts | The Washington Post | 21 Feb 2017 |
| Easy marks | Wall Street Journal | 20 Jan 2017 |
| Nitwits | ||
| Knuckleheads | Newsday | 28 Feb 2016 |
| Foolish ones | Newsday | 04 Oct 2015 |
| Fools | LA Times Daily | 27 Mar 2015 |
| Foolish ones | ||
| Fools | ||
| Fools | ||
| Dimwits | ||
| Dimwits | ||
| Foolish ones | ||
| Fools | ||
| Ninnies | ||
| Ninnies | ||
| Foolish fellows | ||
| Dimwits | ||
| Fools | ||
| Fools | ||
| Nincompoops | ||
| Nincompoops | ||
| Chuckleheads | ||
| Ninnies | ||
| Nitwits | ||
| Fools, in short | ||
| Foolish ones | ||
| Bozos | ||
| Foolish fellows | ||
| Fools | ||
| Dopes | ||
| Nincompoops: Slang. | ||
| Dumb bunnies. | ||
| Stupid people: Slang. |