Degrees of comparison for the given adjectives:

Old: older, oldest
Good: better, best
Bad: worse, worst
Ugly: uglier, ugliest
Beautiful: more beautiful, most beautiful
Sad: sadder, saddest
Short: shorter, shortest
Funny: funnier, funniest
Fat: fatter, fattest
Young: younger, youngest
Fantastic: more fantastic, most fantastic
Favorite: more favorite, most favorite
Comfortable: more comfortable, most comfortable
Happy: happier, happiest
Big: bigger, biggest
Nice: nicer, nicest