Senses relating to tangible things.
The mighty Magnet from the Center darts / This ſtrong, tho' ſubtile Force, thro' all the Parts: / Its active Rays ejaculated thence, / Irradiate all the wide Circumference.
Senses relating to intangible things.
People or things that are subtle (adjective sense) as a class.
The adjective is derived from Middle English sotil, soubtil, subtil (“of a person, the mind, etc.: clever, ingenious, penetrating; cunning, sly; insidious; delicate, fine; not dense, light, thin; fine...
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A fire ſubtle ye, are ye ſo crafty.