The term 'questioner' often implies curiosity or a genuine interest in learning more information. The questioner at the lecture seemed genuinely curious about the topic presented.
Pro Tip 2/3
Not Always Doubtful
Despite possible associations, a 'questioner' isn't necessarily doubting; they could be clarifying. The questioner wanted to clarify details about the experiment's procedure.
Pro Tip 3/3
Neutral Connotation
'Questioner' alone doesn't suggest hostility; the attitude is suggested by adjectives like 'persistent' or 'unidentified'. The persistent questioner kept asking until his concerns were addressed.