| difficult problem(noun, expression, question, puzzle, riddle) |
| knot(noun, trouble, difficulty, pain, struggle) |
| opposite(noun, reverse, flaw, contrary, puzzle) |
| perplexity(noun, trouble, difficulty, pain, struggle) |
| heresy(noun, deception, mistake, error, falsehood) |
| invalidity(noun, deception, mistake, error, falsehood) |
| juxtaposition(noun, property, conclusion, outcome) |
| misconstrual(noun, deception, mistake, error, falsehood) |
| mistake(noun, deception, error, falsehood, deviation) |
| question(noun, problem, secret, conundrum) |
| reverse(noun, contrary, puzzle, absurdity, inconsistency) |
| shocker(noun, property, conclusion, outcome) |
| koan(noun, property, conclusion, outcome) |
| dichotomy(noun, twist, humor, contradiction) |
| illogicality(noun, deception, mistake, error, flaw) |
| oxymoron |
| reverse psychology(expression, psychology, property, contradiction) |