Common Words:
* Beautiful: full of beauty
* Careful: full of care
* Cheerful: full of cheer
* Colorful: full of color
* Doubtful: full of doubt
* Faithful: full of faith
* Fearful: full of fear
* Helpful: full of help
* Hopeful: full of hope
* Joyful: full of joy
* Meaningful: full of meaning
* Painful: full of pain
* Powerful: full of power
* Successful: full of success
* Thoughtful: full of thought
* Wonderful: full of wonder
Less Common Words:
* Achingful: full of aching
* Awful: full of awe (can also be used to mean terrible)
* Boastful: full of boasting
* Bountiful: full of bounty
* Caressful: full of caresses
* Dutiful: full of duty
* Exultful: full of exultation
* Graceful: full of grace
* Grateful: full of gratitude
* Handful: (a small amount; often used in the phrase "a handful of")
* Hateful: full of hate
* Hopeful: full of hope
* Hurtful: full of hurt
* Lawful: according to law
* Merciful: full of mercy
* Peaceful: full of peace
* Playful: full of play
* Poignantful: full of poignancy
* Shameful: full of shame
* Skillful: full of skill
* Sorrowful: full of sorrow
* Thankful: full of thanks
* Trustful: full of trust
* Truthful: full of truth
* Useful: full of use
* Wrathful: full of wrath
This list isn't exhaustive, but it gives you a good starting point for exploring words with the "-ful" suffix.