Noun
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uncertainty about the truth or factuality or existence of something
"the dubiousness of his claim"
"there is no question about the validity of the enterprise"
-
the state of being unsure of something
Verb
-
lack confidence in or have doubts about
"I doubt these reports"
"I suspect her true motives"
"she distrusts her stepmother"
-
consider unlikely or have doubts about
"I doubt that she will accept his proposal of marriage"