← DefinitionshareGuesshalcyonadjectiveDenoting a period of time in the past that was idyllically happy and peaceful.nounA mythical bird, often identified with the kingfisher, said to nest at sea during the winter solstice and calm the waves.SynonymspeacefuladjectivesereneadjectiveidyllicadjectivetranquiladjectiveAntonymsstormyadjectiveturbulentadjective