Past participial adjective
For example, "I am bored" is derived from the verb "bore". With a regular verb, these end in -ed. Note that with many irregular lexical verbs, the past participle ends in -en, e.g. "a half-eaten cake", "a sunken ship".
Sometimes, particularly with irregular verbs that have undergone regularisation, the past participial adjective may reflect an older inflection while in modern usage the past participle is either regular or identical to the preterite. For example, "molten lava" rather than *"melted lava" (from melt); a "proven case" rather than ?"proved case" (from prove); a "clean-shaven face" rather than "a clean-shaved face" (from shave); a "sunken ship" rather than a *"sunk ship" (from sink); a "stricken ship" rather than *"a struck ship" (from strike).
Students may confuse past participial adjectives with present participial adjectives and say things like #"I am boring" when they mean "I am bored".