adj.不能下定義的；不確定的

Jean Valjean, on his side, experienced a deep and undefinable oppression at heart. 在另一方面，冉阿讓卻感到心情無比沉重，一顆心好象被什么揪住了似的。

Some undefinable time later, Obi-Wan felt his head and shoulders breach the surface of the lightless ocean. 不知過了多久，歐比旺終于感覺到腦袋和雙肩浮出了那暗無天日的海洋的水面。

Later, he would tell her that in ways undefinable, watching her take off her boots that day was one of the most sensual moments he could remember. 后來,他告訴她他自己也莫名其妙,那天看著她脫靴子的時候是他記憶中最肉感的時刻。

The magical photograph attempts to go beyond the immediate context of the recorded experience into realm of the undefinable. 具有魔幻般的照片試圖超越媒體本身，從而將記錄的體驗放在一個難以界定的領(lǐng)域之中。

Although most people have the essentials of living taken care of, they still have an undefinable emptiness within their hearts. 雖然,人活在繁華的生活中,但大多數(shù)的人,內(nèi)心彌漫著一股莫可名狀的處空,苦悶和抑郁。