na-adjective
unresponsive; showing no reaction
Describes a person or thing that does not react or respond to stimuli, questions, or events. Often used in medical, psychological, or everyday contexts.
患者は呼びかけに無反応だった。
The patient was unresponsive to being called.
彼は私の冗談に無反応で、少
He showed no reaction to my joke, and I felt a bit lonely.