She grew up with a fearful parent who constantly warned her about dangers.

fearful 是由名词 fear（恐惧）加上形容词后缀 -ful 构成的形容词，表示"充满恐惧的"或"容易担心的"。在句中形容家长总是处于担忧状态，习惯性地预想各种危险情况。