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
Mysterious is a synonym for deep in abstract topic. In some cases you can use "Mysterious" instead an adjective "Deep", when it comes to topics like profound, obscure, secret. popular alternative
Mysterious
Mysterious adjective - Being beyond one's powers to know, understand, or explain.
Usage example: the huge stone statues on Easter Island are ancient, mysterious, and haunting
Deep is a synonym for mysterious. You can use "Deep" instead an adjective "Mysterious". popular alternative
Nearby Words: mystery, mysteriously
Mutual synonyms
Related pairs
Both words in one sentence
- In Japan, dark and angsty young guys (especially pretty ones) tend to be well-liked by audiences, often per their perceived mysterious and deep characteristics.
Source: Analysis / Americans Hate Tingle -
Self-Deprecation: Jane, subtly yet constantly (for instance denying that she is as deep and mysterious as her hobbies make her seem, when her videos prove that and attributing her accomplishment to other people's work).
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Herriman tells him that it contains "deep, dark, mysterious secrets" (emphasis on secrets, as Bloo can't resist knowing them and then letting them out).
Source: Forbidden Fruit
Cite this Source
Mysterious and Deep. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/deep/mysterious
Deep & Mysterious. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/deep/mysterious>.
Mysterious or Deep. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/deep/mysterious.
Google Ngram Viewer shows how "deep" and "mysterious" have occurred on timeline