unknown unknown

名词 n.
中文释义

英文释义

名词 n.
  1. An uncertainty of unknown magnitude, consequence, structure, and probability characteristics, possibly with completely unsuspected existence; something that we don't know that we don't know.
    — This means there are technical unknowns, unknown unknowns, and technical uncertainties in the contract.

词形变化

unknown unknowns plural

词源

Popularized by Donald Rumsfeld in 2002, though used much earlier.
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