The word(s) "feeble" appears 2 time(s) in 2 verse(s) in Quran in Mohsin Khan translation.

(1) Those who believe, fight in the Cause of Allah, and those who disbelieve, fight in the cause of Taghut (Satan). So fight you against the friends of Shaitan (Satan). Ever feeble indeed is the plot of Shaitan (Satan).

(سورة النساء, An-Nisaa, Chapter #4, Verse #76)
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(2) He said: "My Lord! Indeed my bones have grown feeble, and grey hair has spread on my head, And I have never been unblest in my invocation to You, O my Lord!

(سورة مريم, Maryam, Chapter #19, Verse #4)
(Arabic, Transliteration, Urdu (Ahmed Ali), Urdu (Jalandhry), Farsi, Yusuf Ali, Shakir, Picthal, Mohsin Khan, French, Spanish, Indonesian, Malay, German, Bosnian, Russian, Dutch, Italian, Portuguese, Tafsir - Jalal ad-Din, Tafsir - King Fahad Quran Complex)