In a way that shows doubt or unwillingness to accept something as true.
The adverb form of 'disbelieving,' created by adding the '-ly' suffix to express manner or how an action is performed. This follows standard English adverb formation patterns.
When you say 'She shook her head disbelievingly,' you're describing not just an action but the emotional attitude behind it, making it more expressive than just saying 'she shook her head.'
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