It’s even better than great, like your wonderful luck — finding buried treasure on your very first diving expedition.
When you look at the parts that make us wonderful, it is easy to see that it means “full of wonder,” or awe, admiration, even surprise. The giant Rockefeller Center Christmas tree lit up in all its splendor is a wonderful sight — tourists and New Yorkers alike stop to stare. Other things that are wonderful are very personal to you, like wonderful memories of spending time with your grandparents.
