Entry 2 senses · 2 variants Webster, 1913 Misconjecture · Mis·con·jec·ture · IPA /mɪskənˈd͡ʒɛkt͡ʃə(ɹ)/ n. v. t. & i. 01 n. A wrong conjecture or guess. 1. A wrong conjecture or guess. 02 v. t. & i. To conjecture wrongly. 1. To conjecture wrongly.