naively

I naively assumed that the landlord would return my deposit without any trouble.

(Chinese) 我天真地以为房东会毫无麻烦地退还我的押金。

She naively thought that the stray dog would stay in the yard without a fence.

(Chinese) 她幼稚地以为那只流浪狗在没有围栏的情况下也会待在院子里。