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Latin word vanitas comes from Latin -ius, Latin vanus
-ius (Latin)
Genitive suffix for some irregular pronouns. Forming adjectives from nouns.
vanus (Latin)
(figuratively) groundless, baseless, meaningless. Deceptive, untrustworthy. Ostentatious, boastful. Unsubstantial. Vain, empty, vacant, void.
vanitas (Latin)
Emptiness, nothingness. Falsity, falsehood, deception, untruth, untrustworthiness, fickleness. Vanity, vainglory.