Lacking a response; unresponsive—used for people, machines, or chemical samples that show no reaction or reply.
患者はショックで無反応になり、すぐに救急処置が必要だった。
The patient became unresponsive from shock and needed immediate emergency treatment.
何度メールを送っても彼からは無反応だった。
No matter how many emails I sent, he remained unresponsive.
試験管に薬品を入したが、観察期間中は無反応だった。
I added the reagent to the test tube, but there was no reaction during the observation period.