いいしれぬ の訳語→ indescribable ineffable nameless peculiar some
えもいわれぬ の訳語→ exquisitely indescribably
異様な の訳語→ bizarre deeply disturbed ghostly grisly odd out-of-kilter remarkable screwed-up strange twisted untoward unusual weird wonderfully
重大な の訳語→ big crucial delicate important quantum ultimate