Keep the two routes separate. For a proper name, the relevant verb-pattern test is that the form is on a pattern particular to verbs or, where the pattern is shared, begins with one of the imperfect markers أ، ن، ي، ت; no feminine test is applied to a proper name. For an adjective, the qualifying أَفْعَلُ-type form must have a feminine not made with round tā (ة), such as أَحْمَرُ → حَمْرَاءُ.
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The Governing Rule
Cause of Ghayr Munsarif: The Pattern of a Verb
Keep the two routes separate. For a proper name, the relevant verb-pattern test is that the form is on a pattern particular to verbs or, where the pattern is shared, begins with one of the imperfect markers أ، ن، ي، ت; no feminine test is applied to a proper name. For an adjective, the qualifying أَفْعَلُ-type form must have a feminine not made with round tā (ة), such as أَحْمَرُ → حَمْرَاءُ.