In a conjectural manner.

In the nature of a conjecture, or based on a conjecture.

Something that is conjectural; a conjecture.

plural of conjectural

(philosophy) The belief that intentionally supposing that a proposition is true is a good reason to believe that proposition in the absence of evidence of its falsehood.

The property of being conjectural.

Able to be conjectured upon.

In a conjecturable manner

a person who conjectures

plural of conjecturer