ref – https://www.grammar-monster.com/glossary/adjective_phrases.htm

An adjective phrase is a group of words headed by an adjective that describes a noun or a pronoun.

In front of nouns

Attributive Adjectives

Position: These are adjectives that come directly before the noun they modify. They are part of the noun phrase.

Example: the blue car, a happy child, delicious food
Function: They give us essential information about the noun, helping to define or identify it.

Not After a Linking Verb: Attributive adjectives do not come after a linking verb like “is” or “seems.”

She had extremely menacing eyes.

She – subject
had – linking verb
extremely menacing – adjective phrase (group of words)
eyes – noun

Incredibly talented: [The incredibly talented musician] played the piano beautifully.

Very old: [The very old tree] stood tall in the forest.

Rather large: [The rather large house] didn’t cost much.

Extremely happy: [The extremely happy children] plays in the snow.

Prepositional Phrases as Adjective Phrases:/h1>

The dog covered in mud is mine.

The dog – subject
covered in mud – prepositional phrase
is – linking verb
mine – sc: noun

Sarah(s) was(lv) hostile towards me (adj phrase).

People(s) are(lv) so sick of them (adj phrase).