Vine's Expository Dictionary of NT Words
Eng., "agony," was used among the Greeks as an alternative to agon, "a place of assembly;" then for the contests or games which took place there, and then to denote intense emotion. It was more frequently used eventually in this last respect, to denote severe emotional strain and anguish. So in Luke 22:44 , of the Lord's "agony" in Gethsemane.
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Vines, W. E., M. A. Entry for 'Agony'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/a/agony.html. 1940.