con·jec·tur·al \kənˈjekchərəl, -ksh(ə)rəl\adjective Etymology: Latin conjecturalis, from conjectura + -alis -al 1.: of the nature of or involving or based on conjecture < conjectural emendations > 2.: given to conjectures < a conjectural critic — Samuel Johnson > • con·jec·tur·al·ly\-lē, -li\adverb