In plain English
Something is invalid when what was entered fails the checks it is required to satisfy. That means it breaks a needed condition, so it cannot be accepted as entered.
In context
Here, invalid indicates that the field entry is not accepted because it does not satisfy the required rules or constraints.
- Situation
- Reading processing, queue, validation, success, warning, and error messages
- What it communicates
- marks a field entry as not accepted
Meaning limits
By itself, invalid does not say which rule was not met or how the input should be changed.
Examples
“Her postal code was invalid, so the form would not accept it.”
“The phone field turns invalid if a letter is entered.”