Dubious
Dubious adjective - Giving good reason for being doubted, questioned, or challenged.
Usage example: any letter bearing the signature of Geronimo would be of dubious authenticity, to say the least
Open and dubious are semantically related in doubtful topic. In some cases you can use "Open" instead an adjective "Dubious", when it comes to topics like vague.
Mutual synonyms
Both words in one sentence
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Maybe Magic, Maybe Mundane: By playing up the psychological element - specifically, Nell's dubious sanity - the film leaves open the possibility that nothing supernatural was happening.
Source: Film / The Haunting (1963) - Considering that his course of action after failing to kill the heroes is to push the parallel world out of its orbit with a giant jet so that the gates don't open, his claims are somewhat dubious.
Source: Video Game / Para World -
Worms: Open Warfare 2 on the DS has the dubious honor of managing to have this on a cartridge-based game.
Source: Loads and Loads of Loading
Cite this Source
Open and Dubious. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/dubious/open
Dubious & Open. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/dubious/open>.
Open or Dubious. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/dubious/open.
Google Ngram Viewer shows how "dubious" and "open" have occurred on timeline