conjectural
US /kənˈdʒek.tʃɚ.əl/
UK /kənˈdʒek.tʃɚ.əl/

1.
conjectural, spéculatif
based on or involving conjecture; speculative.
:
•
The report contained many conjectural statements about the future.
Le rapport contenait de nombreuses déclarations conjecturales sur l'avenir.
•
His theory remains highly conjectural without further evidence.
Sa théorie reste très conjecturale sans preuves supplémentaires.