trusting
adjective uk/ˈtrʌs.tɪŋ/ us/ˈtrʌs.tɪŋ/ (also trustful)
容易相信他人的，轻信的
always believing that other people are good or honest and will not harm or deceive you
The child gave a warm, trusting smile. 那个孩子露出可爱而充满信任的微笑。
You shouldn't be so trusting - people take advantage of you. 你不应该这样轻信别人——会被人利用的。