Formidable
Formidable adjective - Requiring considerable physical or mental effort.
Usage example: running a marathon is a formidable undertaking
Testing and formidable are semantically related. In some cases you can use "Testing" instead an adjective "Formidable".
Nearby Word: formidably
Testing
Testing adjective - Requiring considerable physical or mental effort.
Usage example: beginning rock climbers should choose a less testing route to the summit
Formidable and testing are semantically related. Sometimes you can use "Formidable" instead an adjective "Testing".
Mutual synonyms
Related pairs
Cite this Source
Testing and Formidable. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/formidable/testing
Formidable & Testing. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/formidable/testing>.
Testing or Formidable. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/formidable/testing.
Google Ngram Viewer shows how "formidable" and "testing" have occurred on timeline