Etymology
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voluble (adj.)

late 14c., "able to turn, revolving;" early 15c., "liable to constant change," from Latin volubilis "that turns around, rolling, flowing," figuratively (of speech) "fluent, rapid," from volvere "to turn around, roll" (from PIE root *wel- (3) "to turn, revolve"). Meaning "fluent, talkative" is recorded from 1580s. Related: Volubly.

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volubility (n.)

1570s, from French volubilité (16c.) or directly from Latin volubilitatem (nominative volubilitas) "a rapid turning," figuratively "fluency (of speech)," from volubilis (see voluble).

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