English Dictionary

unknown unknown

名詞

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.

日本語の意味

影響や規模、構造、発生確率などが予測不可能な未知の要素、または存在すら認識されていない未知の事象を指す。 / 自分自身が気づいていない、予期しない問題やリスク、または出来事の状態。 / 未知の性質を持つ、全く予測できず分析困難な事柄や状況。

When planning the mission, we had to account for at least one unknown unknown that could derail our timeline.

任務を計画する際、規模・影響・構造・発生確率が不確定で、存在自体がまったく予想されていない可能性のある未知の不確実性を少なくとも一つ考慮しなければならなかった。

意味（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.

unknown unknowns （ plural ）