discourager
n. 沮丧;妨碍;劝阻者
例句
It may act as a discourager.
它可能会起到令人气馁的作用。
Avoid comparing a second-born to an elder sibling , which can act as a discourager .
避免把排行中间的拿来和排行老大的比较,这可能会造成反作用。