Non-gradable
Non-gradable adjectives are adjectives like ‘married’ or ‘wooden’. You can’t be very married or a bit married. Non-gradable adjectives do not have different degrees.
Adjectives like ‘terrifying’, ‘freezing’ ‘amazing’ are also non-gradable adjectives. They already contain the idea of ‘very’ in their definitions – ‘freezing’ means ‘very cold’ etc.