(nonstandard) supposedly

Able to be supposed or conjectured. / (nonstandard) Supposedly.

The act of supposing; supposition. / Something supposed; a supposition, a hypothesis.

plural of supposal

The quality of being supposable.

present participle of suppose

The act of making a supposition.

if hypothetically (optionally followed by that)

plural of supposing

(formal) Used to introduce a question, implying that eliciting an affirmative answer from the interlocutor would be unlikely yet desirable for the speaker.