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Questioner
Curiosity Tone
The term 'questioner' often implies curiosity or a genuine interest in learning more information. 
Not Always Doubtful
Despite possible associations, a 'questioner' isn't necessarily doubting; they could be clarifying. 
Neutral Connotation
'Questioner' alone doesn't suggest hostility; the attitude is suggested by adjectives like 'persistent' or 'unidentified'. 