| enigma(noun, trouble, challenge, question, secret) |
| riddle(noun, trouble, challenge, question, secret) |
| mystification(noun, trouble, concern, anxiety, confusion) |
| confusion(noun, trouble, concern, anxiety, doubt) |
| mystery(noun, trouble, challenge, secret, puzzle) |
| puzzle(noun, trouble, concern, anxiety, confusion) |
| bafflement(noun, confusion, uncertainty, perplexity, bewilderment) |
| quandary(noun, trouble, concern, anxiety, confusion) |
| perplexity(noun, trouble, concern, anxiety, confusion) |
| bewilderment(noun, trouble, concern, anxiety, confusion) |
| conundrum(noun, trouble, challenge, question, secret) |
| problem(noun, trouble, challenge, question, secret) |
| befuddlement(noun, confusion, uncertainty, turmoil, muddle) |
| bemusement(noun, confusion, uncertainty, turmoil, embarrassment) |
| closed book(noun, expression, trouble, challenge, question) |
| poser(noun, trouble, challenge, question, secret) |
| why(noun, trouble, challenge, question, secret) |
| astonishment(noun, uncertainty, surprise, perplexity, bewilderment) |
| brain-teaser(noun, trouble, challenge, question, puzzle) |
| embarrassment(noun, confusion, question, uncertainty, turmoil) |