同義字(5)上位詞(0)字根(4)主題(0)

同義字problematicalMentally demanding; very tough to understand or believe.

同義字knottyMentally demanding; very tough to understand or believe.

同義字elusiveMentally demanding; very tough to understand or believe.

同義字problematicMentally demanding; very tough to understand or believe.

同義字toughMentally demanding; very tough to understand or believe.

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