Disabled state
Also called: disabled, inactive, greyed out.
How a control looks when you can't use it yet: grayed out, not clickable. Good ones also say why.
Normal
Say it in a prompt
Show the button in a disabled state until the terms are accepted: gray background, gray text, a not-allowed cursor, and a short line under it saying why. Seen on
- Duolingo: A disabled button turns gray.
You might describe it as
- grayed out button I can't click
- button is off until I fill the form
- faded inactive button