Something is beautiful if it gives you great pleasure to see, hear or experience. The rose in the picture is beautiful.
Something is best if nothing is better than it. When you win a competition, it means you are the best. The opposite of best is worst.
Someone is brave if they do something that would make other people afraid. The man in the picture is getting an award for bravery.
It is calm weather when there is no wind. In general, something is calm if it is almost still, with very little movement and excitement. The opposite of calm is excited.
Something is clean if it has no dirt or marks to spoil its looks, and it is neat and tidy. The opposite of clean is messy or dirty.
Something is comfortable if it feels nice to use. You are comfortable if you feel good and at ease while doing something. The dog in the picture is in a very comfortable chair.
Something is cute if it is attractive, and small or young. Things that are often described as cute include kittens, puppies and babies, but many other things can be called cute too.
Something is delicate if it has fine detail, or is fragile. A color or flavor is delicate if there is only the barest hint of it.
Something or someone is elegant if it is gracefully refined and dignified.
You are excited when you are really really happy about something. People get excited when they win the lottery, or are about to go away on holidays. Children often get excited at parties. People who are excited sometimes jump up and down and wave their arms around.