amount ADJThe adjective follows a noun group which indicates an amount.
Adjectives with other meanings
A number of adjectives with this pattern indicate how much something measures. The measurement may be of size, duration, age, or, in the case of proof, alcoholic content.
deep high long old proof square tall thick wide
There was water everywhere - several feet deep.
Each semester is 15 weeks long and ends with a three-week assessment period.
At only 17 per cent proof, the Irish whiskey-based drink is sufficiently gentle to appeal to a wide audience.
Colin Gibson shares a corrugated-iron hut about three metres square with four other adults.