أَحْمَرُ: adjective + pattern أَفْعَلُ; therefore ghayr munsarif in the taught rule.
كَرِيمٌ: adjective, but not on this taught pattern; therefore adjectival meaning alone does not remove tanwin.
The decision depends on the combination of causes, not merely on the translation “an adjective.”
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Causes of Ghayr Munsarif: Wasf and the Pattern Af'al
أَحْمَرُ: adjective + pattern أَفْعَلُ; therefore ghayr munsarif in the taught rule.
كَرِيمٌ: adjective, but not on this taught pattern; therefore adjectival meaning alone does not remove tanwin.
The decision depends on the combination of causes, not merely on the translation “an adjective.”