| enigma(noun, mystery) |
| problem(trouble, difficulty, question, mess, puzzle) |
| bewilderment(noun, doubt, question, problem, secret) |
| complex problem(noun, expression, trouble, difficulty, mess) |
| complexity(trouble, difficulty, mess) |
| complicated situation(expression, trouble, difficulty, mess) |
| complication(trouble, difficulty, mess) |
| difficult situation(expression, trouble, difficulty, mess) |
| difficulty(trouble, mess) |
| entanglement(trouble, difficulty, mess) |
| hard nut to crack(noun, expression, idiom, trouble, difficulty) |
| headache(trouble, difficulty, mess) |
| hot water(expression, trouble, difficulty, mess) |
| predicament(trouble, difficulty, mess) |
| quagmire(trouble, difficulty, mess) |
| quandary(trouble, difficulty, mess) |
| snafu(trouble, difficulty, mess) |
| snake pit(expression, trouble, difficulty, mess) |
| snarl(trouble, difficulty, mess) |
| troublesome problem(noun, expression, trouble, difficulty, mess) |