"conjecturing" in the verb sense
1. speculate, theorize, theorise, conjecture, hypothesize, hypothesise, hypothecate, suppose
to believe especially on uncertain or tentative grounds
"Scientists supposed that large dinosaurs lived in swamps"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License