Deep
Deep adjective - Being beyond one's powers to know, understand, or explain.
Usage example: a deep, dark secret that he took to his grave
Obscure is a synonym for deep in abstract topic. In some cases you can use "Obscure" instead an adjective "Deep", when it comes to topics like profound, abstruse, unclear, secret.
Obscure
Obscure adjective - Having an often intentionally veiled or uncertain meaning.
Usage example: a fantasy writer who likes to put lots of obscure references and images in her tales of wizards and warlocks
Deep is a synonym for obscure in abstruse topic. You can use "Deep" instead an adjective "Obscure", if it concerns topics such as unclear, out-of-the-way, not easily understood.
Mutual synonyms
Both words in one sentence
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Right before his client tries to step in and take the hit for him, he proves he knows his stuff, even down to the deep and obscure facts.
Source: Series / Human Target - Usually Chris Claremont was good at showing him reading obscure, if appropriately deep, works.
Source: Genius Book Club - In 1930 Aspen, Colorado, was an obscure former silver mining town deep in the mountains.
Source: Suddenly Significant City
Cite this Source
Obscure and Deep. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/deep/obscure
Deep & Obscure. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/deep/obscure>.
Obscure or Deep. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/deep/obscure.
Google Ngram Viewer shows how "deep" and "obscure" have occurred on timeline