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adjectivedifficult to understand
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Opposite: -
adjectiveincapable of being explained or accounted for
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Synonyms & Similar Words
lost dark deep missed mysterious obscure unclear impenetrable inexplicable unexplained unintelligible enigmatic puzzling cryptic unexplainable unfathomable paradoxical opaque inscrutable mystifying indecipherable unaccountable enigmatical insoluble uncomprehensible incomprehensibility cryptical self-contradictory