Extremely helpful
Key and extremely helpful are semantically related. In some cases you can use "Key" instead an adjective phrase "Extremely helpful".
Key
Key adjective - Coming before all others in importance.
Extremely helpful and key are semantically related. You can use "Extremely helpful" instead an adjective "Key".
Mutual synonyms
Cite this Source
Key and Extremely helpful. (2017). Retrieved 2026, August 07, from https://thesaurus.plus/related/extremely_helpful/key
Extremely helpful & Key. N.p., 2017. Web. 07 Aug. 2026. <https://thesaurus.plus/related/extremely_helpful/key>.
Key or Extremely helpful. 2017. Accessed August 07, 2026. https://thesaurus.plus/related/extremely_helpful/key.
Google Ngram Viewer shows how "extremely helpful" and "key" have occurred on timeline