"Why—" Her eyes clouded; she pursed her lips over the conjectural annoyance.
As for ourselves, we merely indulge in a piece of conjectural criticism.
It is conjectural astronomy, conjectural natural philosophy, conjectural medicine.
Singer's conjectural reading is that; but and seems to me to be the word required.
But there is no need to resort to circumstantial or conjectural ...