prohibitive (adj.)youdaoicibaDictYouDict[prohibitive 词源字典]
c. 1600, "having the quality of prohibiting," from prohibit + -ive, or else from French prohibitif (16c.), from Late Latin prohibit-, past participle stem of prohibere. Of prices, rates, etc., "so high as to prevent use," it is from 1886. Related: Prohibitively.[prohibitive etymology, prohibitive origin, 英语词源]