Open
Open adjective - Being in a situation where one is likely to meet with harm.
Usage example: the country's open to invasion if its borders remain unguarded
Prone is a synonym for open in subject topic. In some cases you can use "Prone" instead an adjective "Open", when it comes to topics like likely, liable.
Prone
Prone adjective - Having a tendency to be or act in a certain way.
Mutual synonyms
Both words in one sentence
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Malevil opens fire when the gates are breached but before the enemy enters the Death Course, the invaders go prone and open fire despite not seeing any of the defenders.
Source: A-Team Firing - Of all the kinds of magician, they tend to be the most open minded and least prone to think there are Un Equal Rites.
Source: Fantasy Character Classes - Usually when someone's lying in a prone position with both eyes open, unblinking, they're dead.
Source: Sleeps With Both Eyes Open
Cite this Source
Prone and Open. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/open/prone
Open & Prone. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/open/prone>.
Prone or Open. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/open/prone.
Google Ngram Viewer shows how "open" and "prone" have occurred on timeline