Answered by Shaykh Yusuf Weltch
Question: Can I make supplication after ghusl and wudu silently (in my heart) as I am in a bathroom?
Answer: In the Name of Allah, the Most Merciful and Compassionate
Yes, it is permissible to make supplication in your heart even if you are in the bathroom.
If you are not in the specific area of the toilet, using the toilet, or your nakedness is not exposed you can even make supplications aloud as the prohibition is only for the specific area of the toilet or while your nakedness is uncovered. [Ala’ al-Din Abidin, al-Hadiyya al-`Ala’iyya]
If, however, you have uncovered or are in the specific area of the toilet then you can say the supplications in your heart. It will not be permissible in those cases to say the supplications aloud. [Ala’ al-Din Abidin, al-Hadiyya al-`Ala’iyya]
May Allah bless you
Allah A’alam
[Shaykh] Yusuf Weltch
Checked and Approved by Shaykh Faraz Rabbani