She is compelling, spectral, fascinating, an unforgettably unique performer.

她的表演很有吸引力，如鬼魅一般，令人着迷，令人难忘，是一个独特的演员。

《柯林斯英汉双解大词典》

This idiom is used to describe unforgettably beautiful singing.

这个成语就形容歌声的美丽与令人难忘。

youdao

A combination of light, caramel and Bavarian malt creates an unforgettably bright color and body for these beers.

它结合了清淡味，焦糖味，及巴伐利亚焦香麦芽味一起来创造一种令人难忘的明亮的颜色及酒体。

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You may or may not like Wilder's answer, but he poses the question unforgettably.

NPR: The Least Material of Material Gifts

Mr. Parrish gave my guys an unforgettably positive impression of this multi-billion dollar global financial services company.

FORBES: How Small Gestures Lead to Big Success

You arrived here already with an impressive record of answering our needs, particularly -- and unforgettably -- in the domain of security.

WHITEHOUSE: The White House