不活性(ふかっせい)

ふかっせい
noun, na-adjective
inactivity; inertness; being inactive
science
1. inactivity; inertness; dormancy
The state of being chemically unreactive, biologically dormant, or functionally inactive.
不活性(ふかっせい)ガスは化学反応(かがくはんのう)を起(お)こしにくい。
Inert gases are unlikely to undergo chemical reactions.
ウイルスが不活性(ふかっせい)化(か)された状態(じょうたい)のワクチンだ。
This is a vaccine made from an inactivated virus.
酸素(さんそ)に触(ふ)れると劣化(れっか)するため、不活性(ふかっせい)ガスを充填(じゅうてん)した容器(ようき)で保管(ほかん)する必要(ひつよう)がある。
Since it deteriorates on contact with oxygen, it must be stored in a container filled with inert gas.

A compound of 不(ふ) (non-/in-) and 活性(かっせい) (activity/reactivity). Used across scientific, medical, and technical fields to describe things that are chemically unreactive, biologically inactive, or functionally dormant.

The term became widely known during the COVID-19 pandemic through discussions of 不活化(ふかつか)ワクチン (inactivated vaccines). In chemistry, 不活性(ふかっせい)ガス refers to noble gases (helium, neon, argon, etc.) that rarely react with other elements.

The related verb form 不活性化(ふかっせいか)する means "to inactivate."

Common collocations

  • 不活性(ふかっせい)ガス: inert gas; noble gas
  • 不活性(ふかっせい)化(か): inactivation
  • 不活性(ふかっせい)な状態(じょうたい): inactive state
  • 不活性(ふかっせい)化(か)ワクチン: inactivated vaccine

Similar words

Related Words

Compare: 不活発(ふかっぱつ) (inactive)
Compare: 休眠(きゅうみん) (dormancy)
general
Added 2026.4.22 18:24 · Revised 2026.9.2 13:02
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