Making great mental demands; hard to comprehend or solve or believe. Synonyms:baffling, elusive, knotty, problematical, tough."I faced the knotty problem of what to have for breakfast" , "A problematic situation at home"
... well done, the curtains part and disclose a stage upon a stage, a problematic question under the most favourable conditions. Herr Jourdain makes by-remarks and interrupts the mimic opera. It is all as antique as the clown at the circus. Finally the opera gets under way and Ariadne publishes her views. ... — Ivory Apes and Peacocks • James Huneker
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