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cruel [cruel 词源字典]: cruel: [13] Aptly, cruelty and crudeness are closely linked etymologically. Cruel comes via Old French cruel from Latin crūdēlis, a relative of Latin crūdus (which actually meant ‘cruel’ as well as ‘raw’ and ‘bloody’). Both come ultimately from an Indo-European base which also produced English raw, Greek kréas ‘flesh’ (whence English creosote and pancreas), and Old Slavic kruvi ‘blood’. (Crude is a 14thcentury borrowing direct from Latin.)
=> creosote, crude, pancreas, raw[cruel etymology, cruel origin, 英语词源]
crude (adj.): late 14c., "in a raw state," from Latin crudus "rough; not cooked, raw, bloody," from PIE *krue-do-, from PIE *kreue- (1) "raw flesh" (see raw). Meaning "lacking grace" is first attested 1640s. Related: Crudely; crudeness. Crude oil is from 1865.
vulgarity (n.): 1570s, "the common people," from Middle French vulgarité and directly from Late Latin vulgaritas "the multitude," from vulgaris (see vulgar). Meaning "coarseness, crudeness" is recorded from 1774.