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n.
uncertainty about the truth or factuality of existence of something; "the dubiousness of his claim"; "there is no question about the validity of the enterprise"
v.
be undecided about something; waver between conflicting positions or courses of action; "He oscillates between accepting the new position and retirement"
n.
freedom from doubt; belief in yourself and your abilities; "his assurance in his superiority did not make him popular"; "after that failure he lost his confidence"; "she spoke with authority"