Conjecture

1. noun

   a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence)

   “speculations about the outcome of the election”

   Similar: speculation

2. noun

   reasoning that involves the formation of conclusions from incomplete evidence

3. noun

   a message expressing an opinion based on incomplete evidence

   Similar: guess, supposition, surmise, surmisal, speculation, hypothesis

4. verb

   to believe especially on uncertain or tentative grounds

   “Scientists supposed that large dinosaurs lived in swamps”

   Similar: speculate, theorize, theorise, hypothesize, hypothesise, hypothecate