The feminine singular pattern is فُعْلَى. It does not arise merely by adding tāʾ marbūṭah to the masculine comparative; the stem pattern changes.
أَكْبَرُ ← كُبْرَى — bigger/greatest, feminine.
أَصْغَرُ ← صُغْرَى — smaller/smallest, feminine.
For instance, الْأُخْتُ الْكُبْرَى means “the elder sister,” with a feminine comparative adjective. “أَكْبَرَةٌ” is not the feminine formation taught in this paradigm.
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Feminine singular: fuʿlā
Ism al-Tafḍīl: Meaning, Eight Forms, Patterns and Use
The feminine singular pattern is فُعْلَى. It does not arise merely by adding tāʾ marbūṭah to the masculine comparative; the stem pattern changes.
أَكْبَرُ ← كُبْرَى — bigger/greatest, feminine.
أَصْغَرُ ← صُغْرَى — smaller/smallest, feminine.
For instance, الْأُخْتُ الْكُبْرَى means “the elder sister,” with a feminine comparative adjective. “أَكْبَرَةٌ” is not the feminine formation taught in this paradigm.