Inane

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mid 16th century: from Latin inanis ‘empty, vain’.

wiktionary

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From Middle French inane, from Latin inānis(“empty, vain, useless”) which is of unknown origin.

etymonline

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inane (adj.)

1660s, "empty, void," from Latin inanis or else a back-formation from inanity (q.v.). Sense of "silly, empty-headed" is from 1819. Related: Inanely. Bailey's Dictionary (1731) has inaniloquent "given to empty talk."