Oversensitivity or hypersensitivity; an unusually strong reaction to stimuli or changes, often used medically or psychologically.
彼は花粉に過敏で、春になるといつもつらそうだ。
He is allergic (hypersensitive) to pollen and always suffers in spring.
顧客の意見に過敏に反応するとかえって混乱を招くことがある。
Reacting too sensitively to customer opinions can sometimes cause confusion.
皮膚が過敏な人は刺激の強い化粧品を避けたほうがいい。
People with sensitive skin should avoid strongly stimulating cosmetics.