cosiest

1.（尤指因地方小或封闭而）温暖舒适的warm, comfortable and safe, especially because of being small or confined

a cozy little room温暖舒适的小房间

a cozy feeling惬意的感觉

I felt warm and cozy sitting by the fire.坐在炉火旁，我感到又暖和又舒服。

2.亲密无间的；密切的friendly and private

a cozy chat with a friend与朋友亲切的闲聊

3.轻易得到的，轻松的（但不一定是诚实或正当的）easy and convenient, but not always honest or right

The firm has a cozy relationship with the Department of Defense.这家公司与国防部关系密切。

The danger is that things get too cozy.危险在于一切都来得太容易。