unperceivable

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WordNet Dictionary
	Definition:		[adj]  impossible or difficult to perceive by the mind or senses; "an imperceptible drop in temperature"; "an imperceptible nod"; "color is unperceivable to the touch"
	Synonyms:		impalpable, imperceptible, incognizable, incognoscible, indiscernible, insensible, subliminal, undetectable, unobservable
	Antonyms:		perceptible
	See Also:		inaudible, invisible, unhearable, unseeable