French-English translations for conjecturer

conjecture
us
I explained it, but it is pure conjecture whether he understood, or not.The physicist used his conjecture about subatomic particles to design an experiment.I do not know if it is true; I am simply conjecturing here.
guess
us
He who guesses the riddle shall have the ringThat album is quite hard to find, but I guess you could try ordering it onlineI guess you were right." "What did he say?" "He guesses you were right

speculateIf it does, then a new situation will arise and I do not wish to speculate on that. Si c'était le cas, nous nous retrouverions alors dans une nouvelle situation et je ne souhaite pas conjecturer là-dessus.
surmisesurmises of jealousy or of envy
wonder
us
Wonders of the World seem to come in sevensThe idea was so crazy that it is a wonder that anyone went along with itHes a wonder at cooking