| 100% | NICEIDEA | 8 | "Why didn't I think of that!" |
| 100% | NEATIDEA | 8 | "Why didn't I think of that?!" |
| 100% | GREATIDEA | 9 | "Why didn't I think of that?!" |
| 97% | NEATIDEA | 8 | "Why didn't I think of that?!" (2 wds.) |
| 87% | WHY | 3 | "___ didn't I think of that?" |
| 74% | THINK | 5 | "Why didn't I ___ of that!" |
| 72% | DIDNT | 5 | ''Why __ I think of that?'' |
| 72% | DIDNT | 5 | "Why __ I think of that?" |
| 72% | DIDNT | 5 | "Why ___ I think of that?" |
| 67% | DUH | 3 | "I can't believe I didn't think of that!" |
| 60% | GEE | 3 | "Huh, I hadn't thought of that" |
| 59% | GEE | 3 | "I hadn't thought of that" |
| 59% | OOH | 3 | "I hadn't thought of that!" |
| 59% | HADNT | 5 | "I __ thought of that" |
| 59% | HADNT | 5 | "I ___ thought of that" |
| 59% | HADNT | 5 | ''I __ thought of that'' |
| 59% | HADNT | 5 | "I ___ thought of that!" |
| 56% | OCCUR | 5 | "That didn't ___ to me" ("I didn't think of it") |
| 55% | HADNT | 5 | "I ____ thought of that until you brought it up." |
| 55% | AMI | 3 | "You really think that of me?" |
| 55% | GREATIDEA | 9 | "Wish I'd thought of that!" |
| 54% | GEE | 3 | "I hadn't thought of it that way" |
| 54% | IMHURT | 6 | "How could you think that of me?" |
| 54% | GOSH | 4 | "Hey, I never thought of that!" |
| 54% | GEE | 3 | "I never thought of that!" |
| 53% | STOOPTO | 7 | "I didn't think he would ___ that level.": 2 wds. |
| 52% | DUH | 3 | "I should've thought of that!" |
| 50% | SEE | 3 | "I can ___ why you'd think that" |
| 50% | GEE | 3 | "Hadn't thought of it like that" |
| 49% | GEE | 3 | "___, I didn't know that!" |