unperceivable

Adjective

Meaning

impossible or difficult to perceive by the mind or senses

Source: WordNet

imperceptible invisible ultraviolet disguised covert unseen dim elusive intangible ethereal inconspicuous insensible inappreciable incognoscible concealed

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pure prominent apparent obvious pronounced evident

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an imperceptible drop in temperature Source: Internet

an imperceptible nod Source: Internet

color is unperceivable to the touch Source: Internet

unpeppered unpeppery unpeppy unperceivably unperceived unperceivedly