Grammar

2.146 submodifying adjectives

Because qualitative adjectives are gradable allowing you to say how much or how little of the quality is relevant, you are more likely to use submodifiers with them than with other types of adjective.

...an extremely narrow road.
...a highly successful company.
...in a slightly different way.
I was extraordinarily happy.
...helping them in a strongly supportive way.
...a very pretty girl.
She seems very pleasant.
...a rather clumsy person.
His hair was rather long.

2.147

Although qualitative adjectives are the most frequently submodified, you can use submodifiers with classifying adjectives (see paragraphs 2.151 to 2.153) and with colour adjectives (see paragraph 2.35). Note that most '-ed' adjectives can be submodified by words such as 'very' and 'extremely', just like other qualitative adjectives.

...a very frightened little girl.
...an extremely disappointed young man.