Etymology
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prohibitive (adj.)

early 15c., prohibitif, "having the quality of prohibiting, serving to forbid," from Medieval Latin prohibitivus, from prohibit-, past-participle stem of Latin prohibere "hold back, restrain, hinder, prevent" (see prohibit). Of prices, rates, etc., "so high as to prevent use," it is from 1886. Related: Prohibitively. Alternative prohibitory (1590s) is from Latin prohibitorius.

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Definitions of prohibitive

prohibitive (adj.)
tending to discourage (especially of prices);
the price was prohibitive
Synonyms: prohibitory
From wordnet.princeton.edu