speculate

verb

1. 1

   reflect deeply on a subject

   I mulled over the events of the afternoon

   philosophers have speculated on the question of God for thousands of years

2. 2

   to believe especially on uncertain or tentative grounds

   Scientists supposed that large dinosaurs lived in swamps

3. 3

   talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion

   We were speculating whether the President had to resign after the scandal

4. 4

   invest at a risk

   I bought this house not because I want to live in it but to sell it later at a good price, so I am speculating