Plural of dubiosity; instances or qualities of being doubtful, questionable, or uncertain.
From 'dubious' plus the suffix '-osity' (creating abstract nouns), which follows the pattern of words like 'generosity' and 'religiosity.' A rare, formal version of 'dubiousness.'
This word is so rare that using it might make people think you invented it—but it's technically correct according to English word-building rules, even if modern English prefers the simpler 'dubiousness.'
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