ques ‧ tion ‧ ing /ˈkwestʃ ə nɪŋ/ BrE AmE adjective
[ Word Family: noun : ↑ question , questioning, ↑ questioner , ↑ questionnaire ; adjective : ↑ questionable ≠ ↑ unquestionable , ↑ questioning ≠ ↑ unquestioning , ↑ unquestioned ; adverb : ↑ unquestionably , ↑ questioningly ≠ ↑ unquestioningly ; verb : ↑ question ]
a questioning look or expression shows that you have doubts about something or need some information:
Mrs Carson gave Ruth a questioning look.
—questioningly adverb