| riddle(noun, trouble, difficulty, challenge, question) |
| enigma(noun, trouble, dispute, difficulty, issue) |
| conundrum(noun, trouble, difficulty, challenge, question) |
| perplex(verb, upset, trouble, clear, bother) |
| confuse(verb, upset, clear, beat, bother) |
| mystery(noun, trouble, dispute, difficulty, issue) |
| bewilder(verb, upset, trouble, clear, beat) |
| baffle(noun, verb, upset, trouble, block) |
| confound(verb, upset, trouble, clear, beat) |
| problem(noun, trouble, worry, concern, point) |
| mystify(verb, upset, trouble, clear, bother) |
| nonplus(noun, verb, upset, trouble, bother) |
| stump(noun, verb, upset, trouble, block) |
| poser(noun, difficulty, challenge, question, secret) |
| befuddle(verb, upset, trouble, clear, cause) |
| flummox(noun, verb, upset, bother, disturb) |
| paradox(noun, trouble, difficulty, challenge, question) |
| question(noun, verb, trouble, concern, point) |
| disconcert(verb, upset, trouble, bother, disturb) |
| dumbfound(verb, upset, beat, bother, disturb) |