Open
Unable
Unable adjective - Lacking qualities (as knowledge, skill, or ability) required to do a job.
Mutual synonyms
Both words in one sentence
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When Leonard finds himself unable to open the jar, he just breaks it open on the edge of the table and accidentally stabs his hand with one of the shards in the process.
Source: Cutting the Knot - After you open it, a cat comes out and opens the door your characters were unable to open by simply pushing it (your characters try to pull it).
Source: Only Smart People May Pass -
They were unable to hold a civil conversation and open up to each other but they were also unable to be apart.
Cite this Source
Unable and Open. (2016). Retrieved 2026, August 07, from https://thesaurus.plus/related/open/unable
Open & Unable. N.p., 2016. Web. 07 Aug. 2026. <https://thesaurus.plus/related/open/unable>.
Unable or Open. 2016. Accessed August 07, 2026. https://thesaurus.plus/related/open/unable.
Google Ngram Viewer shows how "open" and "unable" have occurred on timeline