"doubting" in the verb sense
1. doubt
consider unlikely or have doubts about
"I doubt that she will accept his proposal of marriage"
2. doubt
lack confidence in or have doubts about
"I doubt these reports"
"I suspect her true motives"
"she distrusts her stepmother"
"doubting" in the adjective sense
1. doubting, questioning, skeptical, sceptical
marked by or given to doubt
"a skeptical attitude"
"a skeptical listener"
Source: WordNet® (An amazing lexical database of English)
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