A: I can't click the "Submit" button.
A：我点不了“提交”按钮。

B: It has greyed out because the form is incomplete.
B：它变灰了，因为表格填写不完整。

1) 变灰

2) 界面元素变为灰色且不可用状态

1. 变灰；（计算机）显示为灰色且不可操作

verb

1. to become grey or gray in color, or to become disabled in a digital interface

Synonym: grayed