conjecture

1 to decide the size, amount, number, or distance of (something) without actual measurement he conjectured that the theater could seat 1000 people more or less Synonyms calculate, call, estimate, figure, gauge (also gage), guess, judge, make, place, put, reckon, supposeRelated Words conclude, deduce, extrapolate, gather, infer, reason, understandNear Antonyms calibrate, measure, scale; compute, work out

2 to form an opinion from little or no evidence you're only conjecturing that he was the culprit Synonyms assume, guess, daresay, imagine, presume, speculate, suppose, surmise, suspect, suspicion [chiefly dialect]Related Words conclude, deduce, gather, infer; hypothecate, hypothesize, theorize; believe, conceive, expect, judge, reckon [chiefly dialect], take, thinkNear Antonyms demonstrate, document, establish, prove, substantiate, validate; ascertain, determine, find out, learn