imperceptible, unperceivable
(adjective) impossible or difficult to perceive by the mind or senses; “an imperceptible drop in temperature”; “an imperceptible nod”; “color is unperceivable to the touch”
Source: WordNet® 3.1
unperceivable (not comparable)
Not perceivable; imperceptible.
Source: Wiktionary
12 June 2025
(noun) a decrease in the density of something; “a sound wave causes periodic rarefactions in its medium”
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