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adjective
Impossible or nearly impossible to see; imperceptible by the eye.
synonym: invisible.
is similar to: camouflaged | concealed, hidden, out of sight | infrared | lightless | nonvisual | occult | ultraviolet | undetectable | unseen.
see also: covert | imperceptible, unperceivable.
is the opposite of: seeable, visible.
derivation: invisibility, invisibleness.
Polish: niewidzialny, niewidoczny
Find more on unseeable elsewhere: etymology - rhymes - Wikipedia.
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