致ち死し性せい

noun which may take the genitive case particle 'no', noun

lethal; fatal

Describes something that can cause death, often used in medical, toxicological, or safety contexts.

• この毒どくは致ち死し性せいが高たかい。

  This poison is highly lethal.

• 致ち死し性せいの病びょう気きが流りゅう行こうしている。

  A fatal disease is spreading.