Definify.com

Webster 1913 Edition

Noun.

That which depends upon guess; guesswork.

[R.]

Sir T. Browne.

adv.

In a conjectural manner; by way of conjecture.

Boyle.

adv.

Without proof, or evidence; by conjecture; by guess; as, this opinion was given conjecturally.

conjecturally ‎(comparative more conjecturally, superlative most conjecturally)