Diligent
Diligent adjective - Involved in often constant activity.
Rock solid and diligent are semantically related In some cases you can use "Rock solid" instead an adjective "Diligent".
Nearby Words: diligence, diligently
Rock solid
Diligent and rock solid are semantically related in certain topic. Sometimes you can use "Diligent" instead an adjective phrase "Rock solid".
Mutual synonyms
Cite this Source
Rock solid and Diligent. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/diligent/rock_solid
Diligent & Rock solid. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/diligent/rock_solid>.
Rock solid or Diligent. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/diligent/rock_solid.
Google Ngram Viewer shows how "diligent" and "rock solid" have occurred on timeline