| I dunno |
| You win |
| No idea! |
| Dunno |
| I give up! |
| I'm stumped! |
| I'm clueless! |
| I've no idea! |
| Good question |
| Pfft" [shrug] |
| Hell if I know |
| Heck if I know |
| You Really ___ |
| I have no idea! |
| I haven't a clue! |
| No idea whatsoever |
| Haven't the foggiest |
| Kinks "You Really ___ |
| I haven't the foggiest |
| You've ___" (I give up) |
| Perplexed pronouncement |
| Phrase said with a shrug |
| The Kinks "You Really ___ |
| How on earth would I know? |
| You've ___ Out on a Limb," 1940 song |
| I don't know the answer to this clue! |