Theoretical
Theoretical adjective - Existing only as an assumption or speculation.
Working is an antonym for theoretical.
Working
Working adjective - Capable of being put to use or account.
Usage example: as a would-be independent filmmaker, you'll need a working knowledge of motion picture photography and editing
Theoretical is an antonym for working.
Both words in one sentence
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The Glorft have only theoretical knowledge of time travel, they've never created a working device.
Source: Western Animation / Megas XLR -
Freeman appears to be more of a lab technician, but he is a theoretical physicist working on teleportation as well.
Source: The Professor - Technical know-how and the ability to convert the theoretical knowledge into a working programme.
Source: The Rest of the Nuclear Club
Cite this Source
Working and Theoretical. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/theoretical/working
Theoretical & Working. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/theoretical/working>.
Working or Theoretical. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/theoretical/working.
Google Ngram Viewer shows how "theoretical" and "working" have occurred on timeline