conjectural

[ kuhn-jek-cher-uhl ]

/ kənˈdʒɛk tʃər əl /

of, of the nature of, or involving conjecture; problematical: Theories about the extinction of dinosaurs are highly conjectural.

given to making conjectures: a conjectural thinker.

Origin of conjectural

1545–55; < Latin conjectūrālis, equivalent to conjectūr(a) conjecture + -ālis -al¹

1 speculative, theoretical, doubtful.

con·jec·tur·al·ly, adverb un·con·jec·tur·al, adjective

A reprint of some of Dr Phaers remedies and preservatives, without date, is conjecturally assigned to the year 1601.

A History of Epidemics in Britain (Volume I of II) |Charles Creighton
What are the sentiments of Congress on this subject, and what line they will pursue, can only be stated, conjecturally.

Memoir, Correspondence, And Miscellanies, From The Papers Of Thomas Jefferson |Thomas Jefferson
This is not signed by Redford; it is only conjecturally his.

Early English Dramatists--Recently Recovered "Lost" Tudor Plays with some others |Various
Formerly ascribed to Cosimo Rosselli, the picture is now conjecturally attributed to Botticini (for whom see under 1126).

A Popular Handbook to the National Gallery, Volume I, Foreign Schools |Various

We can answer that question only conjecturally, only from what we know of his general character.

The Expositor's Bible: The First Book of Samuel |W. G. Blaikie

conjectural

/ (kənˈdʒɛktʃərəl) /

involving or inclined to conjecture

conjecturally, adverb