Adjectives that end in -ed describe how someone feels.
- The cats were very interested in the mouse.
(The cats feel interested in the mouse.) - I feel relaxed after my holiday.
(I feel relaxed.) - She felt tired after working all day.
Adjectives that end in -ing describe how the action by something or someone makes them feel.
- The running mouse was interesting for the cats.
(The running action of the mouse was interesting.) - My holiday was relaxing.
(The action of my holiday was relaxing.) - Her work is tiring. She feels tired at the end of every day.