noun, plural con·spir·a·cies.
Origin of conspiracy
Examples from the Web for conspiratorial
Hitchcock leans toward me in a conspiratorial, almost lascivious, way and says, “Let's pile on the menace.”Alfred Hitchcock’s Fade to Black: The Great Director’s Final Days|David Freeman|December 13, 2014|DAILY BEAST
This is the conspiratorial mind using skepticism as a cloak for intellectual laziness.
To add to the conspiratorial flair, they added that the DA told them not to talk to the FBI or the CIA either.
Occasionally his fluent, French-accented sentences will conclude with a conspiratorial giggle.Meet Alexandre Desplat, Hollywood’s Master Composer|Andrew Romano|February 11, 2014|DAILY BEAST
The reactions from the home audience were varied, ranging from the conspiratorial “I knew it!”
Si, si,” he whispered after a conspiratorial glance over his shoulder, “I will do it all; you may trust to me.Jerry Junior|Jean Webster
Before the excogitation of this splendid resolve, he had been observed to wear for some period a conspiratorial aspect.Sandra Belloni, Complete|George Meredith
The madman would read a conspiratorial significance into those empty activities.Orthodoxy|G. K. Chesterton
Deloncle, a high official in the Cagoulards, used the name of "Grosset" in his conspiratorial activities.Secret Armies|John L. Spivak
She cast a conspiratorial glance over her shoulder as she drew from a bulging blouse two buttered rolls.Just Patty|Jean Webster
British Dictionary definitions for conspiratorial
noun plural -cies
Word Origin and History for conspiratorial
mid-14c., from Anglo-French conspiracie, Old French conspiracie "conspiracy, plot," from Latin conspirationem (nominative conspiratio) "agreement, union, unanimity," noun of action from conspirare (see conspire); earlier in same sense was conspiration (early 14c.), from French conspiration (13c.), from Latin conspirationem. An Old English word for it was facengecwis. As a term in law, from 1863. Conspiracy theory is from 1909.