- Based on guesswork or conjecture; not based on knowledge or evidence.
- Having to do with conjecture or the act of conjecture.
Late 16th century: from latin conjecturalis, from conjectura "a conjecture", from conicere "to throw together, guess".
- The historian's conjectural reconstruction of the battle was based on fragmentary accounts and limited archaeological evidence.
- The origins of the painting remain conjectural, as no definitive evidence has been found to support any particular theory.
- The conjectural explanation for the disappearance of the dinosaurs has been widely discredited by the scientific community.
- The conjectural reasoning behind the sudden shift in political power was difficult to discern.
- The conjectural nature of the evidence made it difficult to reach a definitive conclusion.