con·spir·a·to·ri·al 
/kənˌspirəˈtorijəl/ adjective
/kənˌspirəˈtorijəl/ adjective 1 : involving a secret plan by two or more people to do something that is harmful or illegal : of or relating to a conspiracy
▪ conspiratorial plots/plans 2 [more conspiratorial; most conspiratorial] : suggesting that something secret is being shared
▪ She gave me a conspiratorial smile/wink across the table. ▪ His voice became low and conspiratorial.
▪ conspiratorial plots/plans
▪ She gave me a conspiratorial smile/wink across the table. ▪ His voice became low and conspiratorial.
— con·spir·a·to·ri·al·ly adverb
▪ He winked conspiratorially.
▪ He winked conspiratorially.
