conspiratorial
/kənspɪrəˈtɔːriəl
/adjective
1Relating to or suggestive of a secret plan made by a group of people to do something unlawful or harmful: there are several who think this is some sort of vast conspiratorial plot on the part of the press historians have rejected this thesis as conspiratorial and simplistic
1.1(Of a person’s manner or behaviour) suggesting that they share secret knowledge with another person: he gave me a sly, conspiratorial wink
Derivatives
conspiratorially
/ adverb