Etymology
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temerity (n.)

"extreme venturesomeness, rashness, recklessness," late 14c., from Latin temeritatem (nominative temeritas) "blind chance, accident; rashness, indiscretion, foolhardiness," from temere "by chance, at random; indiscreetly, rashly, recklessly;" probably, etymologically, "blindly," from PIE root *temsro- "dark" (adj.), source also of Sanskrit tamisra- "dark night," tamsrah "dark;" Avestan temah "darkness;" Middle Persian tar "darkness," tarig "dark;" Lithuanian tamsa "darkness," tamsus "dark;" Old Church Slavonic tima "darkness;" Old High German dinstar "dark," demar "twilight;" Old Irish temel "darkness."

The connecting notion would be "blindly, in darkness," hence "without foreseeing." Compare Latin tenebrio "dishonest person," apparently "person who operates in darkness" (see tenebrous).

updated on December 12, 2021

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Definitions of temerity from WordNet

temerity (n.)
fearless daring;
Synonyms: audacity / audaciousness
From wordnet.princeton.edu, not affiliated with etymonline.