undownable

形容词 adj.
中文释义
英 /ʌnˈdaʊn.ə.bəl/    美 /ʌnˈdaʊn.ə.bəl/

英文释义

形容词 adj.
  1. Undeniably important; which cannot be played down or ignored. not-comparable,rare
    — If ever there was an example of sheer pluck and undownable determination it is right here[…]
  2. Invincible; which cannot be brought down or overcome. not-comparable,rare
    — The SR-71 is claimed to be undownable by virtue of its altitude and speed.

词源

From un- + downable.
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