late 14c., from Late Latin tempestuosus "stormy, turbulent," from Latin tempestas, tempestus "storm, commotion; weather, season; occasion, time," related to tempus "time, season" (see temporal). For sense development, see tempest. The figurative sense is older in English; literal sense is from c. 1500. Related: Tempestuously; tempestuousness.
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