Having the quality of being unclear, doubtful, or questionable; somewhat dubious or uncertain.
From 'dub' (uncertain origin, possibly onomatopoetic) with an adjectival suffix '-y'. Related to 'dubious' and carries the same sense of doubt or uncertainty.
While 'dubious' is the standard word, 'dubby' appears in regional dialects and older texts—it's a reminder that English once had more colorful, informal versions of words that have now standardized into single forms.
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