| put out(verb, expression, phrasal verb, uncertainty) |
| rebus(noun, difficulty, question, secret, obscurity) |
| solve(verb, resolve, crack, answer) |
| study(verb, perplex, wonder, bewilder, mystify) |
| stumper(noun, trouble, difficulty, challenge, question) |
| worry(noun, verb, upset, trouble, bother) |
| becloud(verb, upset, trouble, obscure, confuse) |
| buffalo(verb, confuse, baffle, throw, confound) |
| cipher(noun, confidence, secret, mystery) |
| closed book(noun, expression, trouble, challenge, question) |
| cloud(verb, upset, trouble, obscure, confuse) |
| code(noun, confidence, secret, mystery, cipher) |
| complicate(verb, upset, trouble, bother, obscure) |
| cryptogram(noun, difficulty, question, secret, obscurity) |
| escape(confuse, confound, evade, flee) |
| fox(verb, confuse, baffle, throw, perplex) |
| mull over(verb, expression, phrasal verb, confuse, baffle) |
| mystifier |
| nut to crack(expression, idiom, difficulty, secret) |
| obscure(verb, adjective, upset, trouble, confuse) |