Formidable
Formidable adjective - Causing fear.
Viperous and formidable are semantically related. In some cases you can use "Viperous" instead an adjective "Formidable".
Nearby Word: formidably
Viperous
Formidable and viperous are semantically related. Sometimes you can use "Formidable" instead an adjective "Viperous".
Nearby Word: viper
Cite this Source
Viperous and Formidable. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/formidable/viperous
Formidable & Viperous. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/formidable/viperous>.
Viperous or Formidable. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/formidable/viperous.
Google Ngram Viewer shows how "formidable" and "viperous" have occurred on timeline