Which of the folllowing is the correct definition of the term participial adjective?

A participle adjective is a past or present participle of a verb being used as an adjective.

For example, broken is the past participle of the verb break.

Past participle as an adjective: He has a broken arm.

Frightening is the present participle of the verb frighten.

Present participle as an adjective: That was a frightening movie.