baffling elusive knotty problematic problematical tough
baffling%5:00:00:difficult:00 elusive%5:00:00:difficult:00 knotty%5:00:00:difficult:00 problematic%5:00:00:difficult:00 problematical%5:00:00:difficult:00 tough%5:00:02:difficult:00
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making great mental demands; hard to comprehend or solve or believe
a baffling problem I faced the knotty problem of what to have for breakfast a problematic situation at home