conjecture

noun

An opinion or conclusion formed on the basis of incomplete information.

verb

Form an opinion or supposition about (something) on the basis of incomplete information.

SYNONYMS

approximationassumptionballpark figurebeliefestimateextrapolationfancyguessguessingguesstimateguessworkhypothesisimagininginferencenotionpostulationpresumptionprojectionrough calculationrough ideashot in the darkspeculationsuppositionsurmisesurmisingsuspiciontheorizingtheory