Which of the following words includes the suffix "-ful"?

The word "hopeful" includes the suffix "-ful," which means "full of" or "having the quality of." In this case, "hopeful" conveys the meaning of being full of hope or having a positive expectation about the future. The suffix "-ful" changes the base word "hope" into an adjective that describes a certain quality related to the root word.

In contrast, the other options do not contain the "-ful" suffix. "Careless" is formed by adding the prefix "care-" to the suffix "-less," meaning without care. "Hopeless" similarly combines the root "hope" with the suffix "-less," indicating the absence of hope. "Dislike" is a verb that stems from combining the prefix "dis-" with the base verb "like," which also does not include the "-ful" suffix. Thus, "hopeful" is the correct answer as it directly demonstrates the meaning and usage of the suffix "-ful."