guesswork
US /ˈɡes.wɝːk/
UK /ˈɡes.wɝːk/

1.
conjecture, supposition
the process of making a judgment or decision without having enough information to know for certain what is correct or true
:
•
The exact number of attendees is still a matter of guesswork.
Le nombre exact de participants est encore une question de conjecture.
•
Much of the early research involved a lot of guesswork.
Une grande partie des premières recherches impliquait beaucoup de conjectures.