Deep
Deep adjective - Firmly established over time.
Usage example: a deep devotion to obtaining justice for all, even society's most disadvantaged
Persistent and deep are semantically related. In some cases you can use "Persistent" instead an adjective "Deep".
Persistent
Persistent adjective - Continuing despite difficulties, opposition, or discouragement.
Deep and persistent are semantically related. Sometimes you can use "Deep" instead an adjective "Persistent".
Mutual synonyms
Both words in one sentence
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Astro City has the Confessor, a ''Batman Expy who intimidates criminals with scary deep voices and persistent rumors of supernatural origins.
Source: Terror Hero -
In the spaceflight simulation game Kerbal Space Program, a persistent physics bug that damaged spaceships or made them uncontrollable was nicknamed "The Deep Space Kraken" by the community.
Source: Kraken and Leviathan - While Sonic games aren't particularly known for deep plot-lines, one persistent fan theory would make Shadow, the series' resident Sonic clone, literally a copy of (Super) Sonic, despite having been genetically engineered fifty years before the series began.
Source: Fanon / Video Games
Cite this Source
Persistent and Deep. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/deep/persistent
Deep & Persistent. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/deep/persistent>.
Persistent or Deep. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/deep/persistent.
Google Ngram Viewer shows how "deep" and "persistent" have occurred on timeline