مَخُوفٌ is the passive participle. It follows the مَفْعُولٌ formation; its weak-letter development does not produce the hamzah seen in خَائِفٌ.
خ و ف → مَفْعُولٌ pattern → مَخُوفٌ
خَائِفٌ — someone who fears.
مَخُوفٌ — someone or something feared.
One lexical root may therefore yield distinct active and passive participial shapes under different morphological patterns.
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Why the Wāw Remains in Makhūf
Complete Conjugation of Khāfa–Yakhāfu: Hollow Wāw from the Samiʿa Class
مَخُوفٌ is the passive participle. It follows the مَفْعُولٌ formation; its weak-letter development does not produce the hamzah seen in خَائِفٌ.
خ و ف → مَفْعُولٌ pattern → مَخُوفٌ
خَائِفٌ — someone who fears.
مَخُوفٌ — someone or something feared.
One lexical root may therefore yield distinct active and passive participial shapes under different morphological patterns.