EXPLANATION
Adjectives that end in -ed generally describe emotions
Ex: He was surprised to see Helen after all those years.
Adjectives that end in -ing generally describe the thing that causes the emotion
Ex: Have you seen that film? It's really frightening.
Here are some adjectives that can have both an -ed and an -ing form.
bored boring
interested interesting
tired tiring
confused confusing
excited exciting
worried worrying