mercuriousness

rare uncountable

(very rare) The quality of being mercurious.

Japanese Meaning

水銀のような性質であること / 水銀的な特性を有する状態

Her mercuriousness during negotiations unnerved the team, as no one could predict when she might suddenly change her stance.

交渉中の彼女の移り気な性質はチームを不安にさせ、誰も彼女がいつ突然立場を変えるか予測できなかった。

Sense（1）

(very rare) The quality of being mercurious.