Temerity is a word that describes excessive boldness or audacity. When writing, it is important to vary vocabulary and not repeat the same words over and over again. Here are some synonyms for temerity: nerve, audacity, boldness, impudence, recklessness, brass, presumption, insolence, chutzpah, effrontery, daring, guts, fearlessness, rashness, foolhardiness. You could use any of these words to convey the idea of someone being overly bold or taking an unreasonable risk. Remember that synonyms have different connotations and can change the tone of your writing, so choose the one that best fits your intended meaning.