unobtrusive
他选择了一个不显眼的角落坐下，以免引起注意。
He chose an ___unobtrusive corner to sit in so as not to draw attention.
她在房间里安静地工作，尽量不打扰别人。
She worked in the room in an ___unobtrusive manner, trying not to disturb others.
她穿着朴素，举止低调，几乎不引人注意。
She wore plain clothes and had an ___unobtrusive manner, hardly drawing any attention.