well organized socially with a very developed culture and way of life

having laws and customs that are fair and morally acceptable

No civilized country should allow such terrible injustices.

having or showing polite and reasonable behaviour

We couldn't even have a civilized conversation any more.

This is not how civilized people behave.

typical of a comfortable and pleasant way of life

Breakfast on the terrace—how civilized!

Let’s go somewhere civilized and have a meal.

LEARNit Dictionary