OVERCONFIDENT
\ˌə͡ʊvəkˈɒnfɪdənt], \ˌəʊvəkˈɒnfɪdənt], \ˌəʊ_v_ə_k_ˈɒ_n_f_ɪ_d_ə_n_t]\
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marked by excessive confidence; "an arrogant and cocksure materialist"; "so overconfident and impudent as to speak to the queen"; "the less he knows the more positive he gets"
By Princeton University
