| 100% | LAS | 3 | "I don't know the words" words |
| 94% | LALALA | 6 | [I don't know the words to this part] |
| 82% | LAS | 3 | Things sung when you don't know the words |
| 81% | LALAS | 5 | What people sing when they don't know the words |
| 81% | LALA | 4 | What to sing when you don't know the words |
| 81% | HUM | 3 | What to do when you don't know the words |
| 80% | HUM | 3 | What you can do if you don't know the words |
| 80% | LALA | 4 | What you might sing if you don't know the words |
| 79% | LALA | 4 | [I don't know the lyrics but I'm singing anyway] |
| 79% | HUM | 3 | What to do when you don't know the words to a song |
| 75% | LALALA | 6 | "I don't know the lyrics" syllables |
| 75% | YES | 3 | "___, no, maybe, I don't know" ("Malcolm in the Middle" theme song lyric) |
| 74% | SPAREME | 7 | "___ the details! I don't want to know!": 2 wds. |
| 74% | PASS | 4 | "I don't know the answer, next question" |
| 74% | ROMAN | 5 | Like the Super Bowl numerals (although I don't know what happened with 50) |
| 73% | GEE | 3 | Word before "I don't know" |
| 71% | BYNOW | 5 | "If You Don't Know Me ___" (Harold Melvin & the Blue Notes song) |
| 70% | SHRUG | 5 | "I don't know" gesture with the shoulders |
| 70% | BYNOW | 5 | "If You Don't Know Me ___" (Harold Melvin & the Blue Notes song) (2 wds.) |
| 70% | SEX | 3 | "I don't know the question, but ___ is definitely the answer": Woody Allen |
| 70% | DALI | 4 | Speaker of the words "I don't do drugs. I am drugs." |
| 67% | THIRD | 5 | I Don't Know's base |
| 67% | TORONTOBLUEJAYS | 15 | "I don't have the words / That rightly commend / Cerulean birds / And Harry's best friend …" |
| 66% | TELL | 4 | "___ me something I don't know!" |
| 66% | TELL | 4 | "___ me something I don't know" |
| 66% | IDK | 3 | I don't know, in text speak |
| 66% | GEE | 3 | "Hmm, I don't know!" |
| 66% | GEE | 3 | "Oh, I don't know" |
| 66% | GEE | 3 | "Hmm, I don't know" |
| 66% | TELL | 4 | "I can't ___ you why" ("I don't know the reason") |