Extensively
Fairly
Fairly adverb - To some degree or extent.
Usage example: for someone without professional training, she sings fairly well
Extensively is an antonym for fairly.
Both words in one sentence
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Jetpacks are otherwise fairly rare on Rifts' Earth, though the Three Galaxies setting uses gravity-based versions fairly extensively.
Source: Jet Pack -
Roaring Rampage of Revenge: Veronica considers this after regaining her memories of being wronged by Po Xu-Ke's nephews, but decides against it after (extensively) calculating that while she has a fairly good chance of achieving her objective, she would certainly not survive the process.
Source: Webcomic / Quantum Vibe - Of course, their relationship is explored fairly extensively, making Riff a possible subversion.
Source: Satellite Character
Cite this Source
Fairly and Extensively. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/extensively/fairly
Extensively & Fairly. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/extensively/fairly>.
Fairly or Extensively. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/extensively/fairly.
Google Ngram Viewer shows how "extensively" and "fairly" have occurred on timeline