No – "boiling" is a non-gradable adjective, so using “slightly” (a gradable modifier) with it is incorrect.

Yes – “quite” can be used with non-gradable adjectives like “amazing,” but the meaning depends on context – it can mean “completely” or “fairly.”

Yes – "delicious" is considered non-gradable and in informal or emphatic speech, modifiers like "completely" are used for emphasis.

A nice red dress – opinion (nice) comes before color (red) in the correct adjective order.

No – "freezing" is non-gradable and doesn’t work with “very.” A correct alternative would be “absolutely freezing.”

Non-gradable – it expresses an extreme state and doesn’t work with modifiers like “very,” but does with “absolutely.”

Yes – "wonderful" is non-gradable, and “absolutely” is an appropriate modifier for non-gradable adjectives.

“She bought a lovely small round French table” – this follows the standard order: opinion, size, shape, origin, noun.

No - this adjective appears after the noun, before you can use sleeping.

It follows the noun ("people") because it's in a predicative position – often used with certain adjectives and participles.

Postpositive adjectives like “interested” can follow certain nouns, especially in formal or legal English, or to distinguish a specific subset.

No. We do not put and between the adjectives of different cathegories.