Argon:
chemical element, 1894, Modern Latin, from Greek argon, neuter of argos "lazy, idle, not working the ground, living without labor," from a- "without" (see
a- (3)) + ergon "work" (see urge (v.)). So called by its discoverers, Baron Rayleigh and Sir William Ramsay, for its inert qualities.
Lethargy:
late 14th-century, litarge, from Old French litargie or directly from Medieval Latin litargia, from Late Latin lethargia, from Greek lethargia "forgetfulness," from lethargos "forgetful," originally "inactive through forgetfulness," from lethe "forgetfulness" (see
latent) + argos "idle" (see
argon). The form with -th- is from 1590s in English.
SOURCE:
Online Etymology Dictionary ----
I love discovering connections between seemingly unrelated words like these two. Incidentally, the British retailer
Argos was so-named because its founder,
Richard Tompkins, came up with the idea while on holiday in the Greek city of
Argos.