con·spir·a·to·ri·al \kənz|pirə|tōrēəl, -n|sp-, -tȯr-\adjective : of, having to do with, or suggestive of conspiracy or a conspiracy < conspiratorial propaganda > < conspiratorial funds > < conspiratorial glances > • con·spir·a·to·ri·al·ly\-rēəlē, -li\adverb