| perplexity(noun, state, feeling, confusion, challenge) |
| puzzlement(noun, state, feeling, confusion, question) |
| brainteaser(noun, challenge, question, thinking, brain) |
| mystery(noun, secret, hidden, unrevealed) |
| problem(noun, challenge, question, thinking, brain) |
| secrecy(noun, secret, mystery, riddle) |
| bafflement(noun, state, feeling, confusion, puzzlement) |
| bewilderment(noun, state, feeling, confusion, puzzlement) |
| challenge(noun, trial, thinking, brain) |
| confusion(noun, state, feeling, puzzlement) |
| daze(noun, state, feeling, confusion, puzzlement) |
| discombobulation(noun, state, feeling, confusion, puzzlement) |
| disorientation(noun, state, feeling, confusion, puzzlement) |
| surprise(noun, state, feeling, confusion, puzzlement) |
| case(noun, challenge, thinking, brain) |
| knot(noun, challenge, thinking, brain) |
| matter(noun, challenge, thinking, brain) |
| poser(noun, challenge, thinking, brain) |
| stumper(noun, challenge, thinking, brain) |
| trouble(noun, challenge, thinking, brain) |