See unavailable.

Or disabled, grayed, unavailable. The state and visual appearance of controls or menu items whose functionality is not presently available to a user.

1. An object that is not available for selection. 2. (programming) A visual effect on an object. A control, such as a button, is dimmed if its visible manifestation represents the state of just one of several objects that are in inconsistent states. When such a control is manipulated (for example, by clicking SELECT over the button), it is no longer dimmed because the manipulation sets the state for all the objects.

made dim or less bright; "the dimmed houselights brought a hush of anticipation"; "dimmed headlights"; "we like dimmed lights when we have dinner"