adjective
US/kənˌspɪr.əˈtɔːr.i.əl/
UK/kənˌspɪr.əˈtɔː.ri.əl/
showing that you share a secret with someone, or taking part in a secret plan
In context
He gave me a conspiratorial smile and whispered that the party was a surprise.
Short entry. Full notes coming.