Hard-core
Hard-core adjective - Firmly established over time.
Cite this Source
Vigorous and Hard-core. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/hard-core/vigorous
Hard-core & Vigorous. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/hard-core/vigorous>.
Vigorous or Hard-core. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/hard-core/vigorous.