To respectfully decline an offer or task, often by humbly admitting one's lack of ability or intelligence; to beg off politely due to perceived incompetence.
承蒙抬爱，邀我担任此职，但我才疏学浅，恐难胜任，谨谢不敏。
Thank you for the kind offer to take on this position, but I fear my humble talents are not up to the task, so I must respectfully decline due to lack of ability.
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