wishy-washy
/ˈwɪʃɪˌwɒʃɪ/adjective
1- (of drink or liquid food such as soup) weak; watery（饮料、汤等）淡而无味的, 味淡如水的。
1.1
- feeble or insipid in quality or character; lacking strength or boldness软弱无力的; 缺乏决断力的：
wishy-washy liberalism.
软弱无力的自由主义。
词源
early 18th cent.: reduplication of WASHY.