Definitions of conjectural

adj based primarily on surmise rather than adequate evidence

“theories about the extinction of dinosaurs are still highly conjectural
circumstantial, divinatory, hypothetic, hypothetical, supposed, suppositional, suppositious, supposititious
theoretic, theoretical
concerned primarily with theories or hypotheses rather than practical considerations

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, can put you on the path to systematic vocabulary improvement.