paradox Synonyms

riddle quandary enigma puzzle contradiction reverse problem poser phenomenon perplexity oxymoron opposite oddity non sequitur another adverse secret paradoxically reverse psychology disproportionateness misconstrual brain-teaser koan contradiction in terms shocker puzzler teaser stumper self-contradiction nonsense mystery crux conundrum contrast contrariety conflict catch antithesis antinomy antilogy anomaly ambiguity dichotomy difficulty dilemma juxtaposition irony inconsonance inconsistency incongruity impossibility