فَعْلٌ الصِّفَةُ المُشَبَّهَةُ

Verbal adjectives which are made like the participles in respect to their inflection /  الصِّفَاتُ المُشَبَّهَةُ

Active and passive particles indicate on an action or occurrence whereas the resembling particles indicate on an attribute

Adjectives are usually made from a verb denoting a quality, status or condition which is not changing or likely to change rather than an action or occurrence

Most of these adjectives come from intransitive verbs الأَفْعَالُ الَّازِمَةُ / verbs that express a state or condition or signify an act which is confined to the subject, and express mostly, a quality inherent and permanent in a person or thing and partly a certain degree of intensity

The forms فَعِيْلٌ and فَعْلٌ are primarily derived from the verb form فَعُلَ