In a manner characterized by doubt; while doubting or with doubt.
Formed from 'doubting' (present participle of 'doubt') plus the adverbial suffix '-ly.' This creates an adverb from a participle, a common English pattern seen in words like 'grudgingly' and 'willingly.'
Writers use 'doubtingly' to show internal conflict in characters—'He looked doubtingly at the map' tells us he's not just looking, he's uncertain, without needing to explain his emotional state directly.
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