nondescript

The spy lived in a nondescript apartment building that looked like every other one on the block.

(Chinese) 那个间谍住在一栋平淡无奇的公寓楼里，看起来和街区里的其他楼房没什么两样。

He was wearing a nondescript gray suit that made him blend into the crowd perfectly.

(Chinese) 他穿着一套毫无特征的灰色西装，这使他完美地融入了人群中。