What does adding the suffix -Ful do to a word?

Adding the suffix "-ful" to a word generally transforms it into an adjective that describes fullness, abundance, or a quality associated with the base word. It indicates the presence or possession of the characteristic denoted by the base word.

Here are some examples:

* Hope + ful = hopeful: Full of hope, optimistic

* Thank + ful = thankful: Feeling gratitude

* Care + ful = careful: Showing attention to detail, cautious

* Pain + ful = painful: Causing pain or discomfort

* Power + ful = powerful: Possessing great strength or influence

However, there are some exceptions where "-ful" doesn't always follow this pattern:

* Hand + ful = handful: A quantity that can be held in one hand, often implying a small amount.

* Mouth + ful = mouthful: An amount that fills the mouth, often implying a large quantity.

Overall, "-ful" is a common and versatile suffix that often adds a positive or descriptive quality to a word.