Is it permissible for a Muslim to say "Allah has overpowered me (Allah qaharani)," based on the fact that among the Beautiful Names of Allah are "Al-Qahir" (The Subduer) and "Al-Qahhar" (The All-Subduer)?

Allah Almighty is the Subduer of all creatures, humiliating them, enslaving them, and overcoming them.

If a person says, "Indeed, Allah has subdued me," with the intention of praising Allah and expressing his submission and servitude to Him, then there is no harm in that.

However, if he says it in the context of complaining about a calamity, pain, or an unfulfilled need, then this is strictly forbidden; because it indicates dissatisfaction with Allah's decree, and may lead to objecting to Him or accusing Him of injustice. The duty is to maintain good manners with Allah and avoid everything that involves discontent or objection.

Trials are expiation for sins and a means of elevating one's rank. The servant must be content with Allah's decree and beware of speech that may lead him to perdition.