na-adjective, noun
Describes writing, speech, or expression that is hard to understand because of vagueness, complexity, or indirectness. Often used in literary or critical contexts.
彼の論文は晦渋で、何を言いたいのかよくわからない。
His paper is so obscure that it's hard to tell what he wants to say.
晦渋な表現を避けて、もっとわかりやすく書いてください。
Please avoid ambiguous expressions and write more clearly.
Composed of 晦 (dark, obscure) and 渋 (astringent, difficult). The combination suggests something that is hard to grasp or penetrate, like a dark, tangled thicket.