guileless

She gave him a guileless look, but he knew he couldn’t really trust her.

朝他诚恳地看了一眼，但是他知道他不能真正地相信。

She was the blue-eyed, black-haired gamine whose voice and guileless charm had been the key to Human victory in the Robotech War.

是个蓝色眼睛，黑色头发淘气女，歌声和不加修饰魅力是第一次宇宙大战中引领人类走向胜利关键。