1. of, of the nature of, or involving conjecture; problematical: Theories about the extinction of dinosaurs are highly conjectural.
  2. given to making conjectures: a conjectural thinker.

Origin of conjectural

1545–55; < Latin conjectūrālis, equivalent to conjectūr(a) conjecture + -ālis -al1
Related formscon·jec·tur·al·ly, adverbun·con·jec·tur·al, adjective

Synonyms for conjectural Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for conjecturally

Historical Examples of conjecturally

British Dictionary definitions for conjecturally


  1. involving or inclined to conjecture
Derived Formsconjecturally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for conjecturally



1550s, from Latin conjecturalis "belonging to conjecture," from conjectura (see conjecture). Related: Conjecturally (mid-15c.).

Online Etymology Dictionary, © 2010 Douglas Harper