Conjecture

An opinion, or judgment, formed on defective or presumptive evidence; probable inference; surmise; guess; suspicion.

To arrive at by conjecture; to infer on slight evidence; to surmise; to guess; to form, at random, opinions concerning.

To make conjectures; to surmise; to guess; to infer; to form an opinion; to imagine.

reasoning that involves the formation of conclusions from incomplete evidence

to believe especially on uncertain or tentative grounds; "Scientists supposed that large dinosaurs lived in swamps"

a hypothesis that has been formed by speculating or conjecturing (usually with little hard evidence); "speculations about the outcome of the election"; "he dismissed it as mere conjecture"