Common words:
* Beautiful
* Wonderful
* Helpful
* Careful
* Successful
* Harmful
* Powerful
* Joyful
* Doubtful
* Thankful
* Hopeful
* Shameful
* Skillful
* Peaceful
Less common words:
* Bountiful
* Cheerful
* Faithful
* Fruitful
* Grateful
* Hateful
* Lawful
* Playful
* Restful
* Truthful
* Wrathful
* Willful
Words with less common meanings:
* Awful (meaning "inspiring awe")
* Dutiful
* Fearful (meaning "inspiring fear")
* Hateful (meaning "inspiring hate")
* Shameful (meaning "inspiring shame")
Note: The prefix "ful" means "full of" or "characterized by."