不登大雅之堂 [ㄅㄨˋ ㄉㄥ ㄉㄚˋ ㄧㄚˇ ㄓ ㄊㄤˊ; bu4 deng1 da4 ya3 zhi1 tang2] lit. not fit for elegant hall (of artwork) not presentable coarse unrefined ◄ ►