riddle, mystery, conundrum, unknown quantity, oddity, admirer, paradox, quandary, mistery, cipher, puzzle, ambiguousness, underachiever, imponderable, metier, paradoxes, archetype, introvert, untalked, anomaly, perplexes, elder statesman, outcast, iconoclast, intrigues, enfant terrible, sphinx, afterthought, achilles heel, obsession, nebulousness, late bloomer, chameleon, poser, idiosyncrasy, mysteriousness, overachiever, duality, dilemma, incubus, phenomenon, autobiographer, populariser, inscrutability, confounding, appreciator, genius, terra incognita, recluse, anagram, mystique, ambiguity, optimist, rara avis, prodigy, solipsist, polymath, pudginess, ageless, baffle, fascination, devilishness, intimidator, eyeopener, amnesiac, egotist, puzzlement, delphic, question, inconsistency, aberration, legend, autodidact, conjurer, extrovert, mirage, mortal, nonentity, muse, alchemist, dubiousness, rorschach test, philosopher, equanimous, oxymoron, lotus eater, tosspot, billet doux, taboo, affliction, inferiority complex, aura, extraordinariness, optical illusion, loose cannon, bugbear, cryptozoology, irrepressibility, stolidity, kidder, pretender, outsider, enigmas, marvel, miracle, riddles, mysteries, secret, antithesis, conundrums, desideratum, disappointment, heartbreak, absurdity

perplexity, problem

brain-teaser, closed book