wishy-washy
/ˈwɪʃɪ ˌwɔʃɪ; ?@ wɔ:ʃɪ; `wɪʃɪˌwɔʃɪ/ adj
(usu derog 通常作贬义) weak or feeble in colour, characteristics, quality, etc （颜色、 特徵、 性质等）浅的, 淡的, 弱的
a wishy-washy blue 淡淡的蓝色
a wishy-washy liberal, ie one whose ideas are not clearly defined 一个稀里糊涂的自由主义者.