Synonyms of stumper

1 Syllable
sphinx, why, rune, crux
2 Syllables
thrillers, thriller, twister, rebus, poser, question, teasers, stickler, sphinxes, occult, teaser, puzzler, chiller, sphinges, puzzlers, riddle, grabber, problem, riddling, chillers
3 Syllables
write-in, cryptogram, job-hunter, mystery, enigma, whodunit, braintwister, brainteaser, mindboggler, mind-twister, mysteries, puzzlement, conundrum, charade, oracle, brain-twister, mind-boggler, secrecy, pothunters, subtlety, cliffhanger
4 Syllables
perplexity, solicitant, abstruseness, candidate, difficulty, perplexities
5 Syllables
abstrusenesses, inscrutableness, mystification
6 Syllables
inscrutability