wishy-washy

• adj. 空泛的；缺乏特点或决心的；淡而无味的；缺乏力量的

来自washy的同韵构词，稀释的，薄的，引申词义稀里糊涂的。

wishy-washy (adj.)

1690s, "feeble or poor in quality," reduplication of washy "thin, watery." Meaning "vacillating" first recorded 1873.