wishy-washy

1. ADJ If you say that someone is wishy-washy, you are critical of them because their ideas are not firm or clear. (思想)不坚定的; 不清楚的[非正式]

If there's anything I can't stand it's an indecisive, wishy-washy customer. 如果说我有什么不能容忍，那就是优柔寡断、挑三拣四的顾客。