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Synonyms for Puzzling (same or very similar meaning)

WordNet sense 1 (not clear to the understanding):
enigmatic, enigmatical

WordNet sense 2 (difficult to understand):
incomprehensible, uncomprehensible

WordNet sense 3 (lacking clarity of meaning; causing confusion or perplexity):
confusing, perplexing

WordNet sense 4 (not clear to the mind):
unclear


From the ODE community, based on WordNetadd/edit