ok i got it...
Here's a clue: -ed and -ing are also stuck onto verbs, and they connote when or how the action takes place. Adding '-ed' makes a lot of verbs past tense, and it also creates the participle for perfect tenses: walk, walked, have walked. What you end up with is a sense of completed action. So, an adjective ending in '-ed' is really a participle used as an adjective, and it, too, implies completed action.
Ex. A washed car is clean. -->The act of washing happened in the past and has been completed. The car is clean as a result. The adjective 'washed' is the participal of the verb 'wash'.
Adding '-ing' makes a verb progressive, meaning that the action is ongoing and incomplete: am walking, was walking, have been walking, etc. When a verb with an '-ing' ending is used as an adjective, it also implies ongoing and incomplete action.
Ex. She's a charming girl. -->The girl has a constant aura of charm that does not dissipate or weaken. Her charm is constant.
If your mind can conceive it and your heart can believe it, have faith that you can achieve it.