[guenthert]

Only when used with non-gradable adjectives/adverbs (from the same surce: https://dictionary.cambridge.org/grammar/british-grammar/qui... ) (and yes, uniform, is quite non-gradable)

(non-native speaker here, quite frustrated about the quite different meanings of 'quite')

[chrisseaton]

'Quite dead' for example means completely dead.

[Dylan16807]

Only because dead is so binary. Any moderately intense modifier on "dead" signifies complete death, even though it won't mean 'completely' with most terms.