Frigging Adjectives

Ce n'est pas facile pour nous. It took me three posts to get the frigging adjective "marvelous" in the post below right -- and I'm still not sure it's right. (Jean-Yves, clue me in man!) Start with the French word "chose" for "thing" -- if I'm right, it's feminine and therefore the adjective has to be the feminine (not "merveilleux" but "merveilleuse") and then to add one more annoying point, it's plural, since "choses" is plural, so you have to use "merveilleuses" not "merveilleuse" -- right? What the hell kind of language is that anyway?. I know, I know, all the romance languages have the same deal. Helluva way to start a romance. So damned complicated.