Word stress in the word "impressed"

[Zoli]

Hello,
Is "impressed" an adjective in "I'm impressed." ? If yes, on which syllable is the word "impressed" stressed when it is an adjective?

impressed
or
impressed

I tried checking multiple online dictionaries but only the root form of the word is shown "impress" which is either a verb or a noun. I'm curious about the stress when it works as an adjective.

 

[SoothingDave]

The noun form is rare. The emphasis for your use is on the second syllable.

This is what I learned as a past participle being used as a predicate adjective.

Not sure what modern grammarians call it.

 

[jutfrank]

The general rule is that when a two-syllable homograph can be used as both a verb and noun, the stress is on the first syllable as a noun and the second syllable as a verb. Past participle forms, even when used as adjectives, follow the rule for verbs. So:

impress (noun)
impress (verb)
impressed (verb/adjective)

import (noun)
import (verb)
imported (verb/adjective)