Reserved
Reserved adjective - Tending not to speak frequently (as by habit or inclination).
Tacit and reserved are semantically related in speech topic. In some cases you can use "Tacit" instead an adjective "Reserved", when it comes to topics like speechless.
Mutual synonyms
Cite this Source
Tacit and Reserved. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/reserved/tacit
Reserved & Tacit. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/reserved/tacit>.
Tacit or Reserved. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/reserved/tacit.
Google Ngram Viewer shows how "reserved" and "tacit" have occurred on timeline