See more synonyms for conjectural on
  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

See more synonyms for on Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for conjectural

Historical Examples of conjectural

British Dictionary definitions for conjectural


  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 conjectural

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

Online Etymology Dictionary, © 2010 Douglas Harper