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temerity [temerity 词源字典]: temerity: [15] Someone who behaves with temerity is etymologically acting in the ‘dark’. The word was adapted from Latin temeritās ‘rashness’, a derivative of temere ‘blindly’, hence ‘rashly’. This in turn was formed from an unrecorded *temus ‘darkness’, a relative of tenebrae ‘darkness’, and hence originally denoted ‘acting in the dark, so that one cannot see’.
[temerity etymology, temerity origin, 英语词源]
hastily (adv.): c. 1300, "quickly," from hasty + -ly (2). Meaning "rashly, without due consideration" is 1580s. Old English hæstlice meant "violently."
race (v.): c. 1200, rasen "to rush," from a Scandinavian source akin to the source of race (n.1), reinforced by the noun in English and by Old English cognate ræsan "to rush headlong, hasten, enter rashly." Meaning "run swiftly" is from 1757. Meaning "run in competition against" is from 1809. Transitive sense of "cause to run" is from 1860. In reference to an engine, etc., "run with uncontrolled speed," from 1862. Related: Raced; racing.
rash (adj.): late 14c., "nimble, quick, vigorous" (early 14c. as a surname), a Scottish and northern word, perhaps from Old English -ræsc (as in ligræsc "flash of lightning") or one of its Germanic cognates, from Proto-Germanic *raskuz (cognates: Middle Low German rasch, Middle Dutch rasc "quick, swift," German rasch "quick, fast"). Related to Old English horsc "quick-witted." Sense of "reckless, impetuous, heedless of consequences" is attested from c. 1500. Related: Rashly; rashness.
rasher (n.): "thin slice of bacon or ham," 1590s, of unknown origin. Perhaps from Middle English rash "to cut," variant of rase "to rub, scrape out, erase." However, early lexicographer John Minsheu explained it in 1627 as a piece "rashly or hastily roasted."
temerarious (adj.): "rash, reckless," 1530s, from Latin temerarius "rash, heedless, thoughtless, indiscreet," from temere "blindly, rashly, by chance" (see temerity). Related: Temerariously; temerariousness.
temerity (n.): late 14c., from Latin temeritatem (nominative temeritas) "blind chance, accident; rashness, indiscretion, foolhardiness," from temere "by chance, at random; indiscreetly, rashly," related to tenebrae "darkness," from PIE root *teme- "dark" (cognates: Sanskrit tamas- "darkness," tamsrah "dark;" Avestan temah "darkness;" Lithuanian tamsa "darkness," tamsus "dark;" Old Church Slavonic tima "darkness;" Old High German dinstar "dark;" Old Irish temel "darkness"). The connecting notion is "blindly, without foreseeing."
wist (v.): "to know" (archaic), c. 1500, from Old English past tense of witan "to know" (cognates: German wusste, past tense of wissen "to know"); see wit. Had-I-wiste was used c. 1400-1550 in sense "regret for something done rashly or heedlessly;" see wist. Proverbial in expression Had-I-wiste cometh ever too late.
Haddywyst comyth euer to late Whan lewyd woordis beth owte y-spronge. ["Commonplace book" in Trinity College, Cambridge, c. 1500]