When you are contented, you feel quietly happy because your life feels enough. You are not hungry for more, and you are not angry about what you do not have. A contented person can sit still and rest. People often use this word about a look you can almost see: a contented smile, a contented sigh, a contented cat in the sun. Though actually, content and contented are very close. “I am content” and “I am contented” both work. But when we talk about a face, a mood, or an animal, contented sounds more natural. It is not a loud happy, and it is not jumping-up-and-down joy. It is more like “this is fine; I can stay here.” You will meet it in stories and in ordinary talk about how someone seems. It is a warm, calm word — not street talk, and not a cold office word either.