The consultant's report was so abstruse that nobody at the meeting could summarize it.

顧問的報告太過深奧，會議上沒有人能概括其內容。

Please rewrite the contract terms in plain language; the current wording is too abstruse.

請用淺白的語言改寫合約條款，目前的措辭太深奧了。

Customers complained that the abstruse instructions made the new software nearly impossible to install.

顧客抱怨說明書艱澀難懂，讓新軟體幾乎無法安裝。