ASVAB Skilled Technical Practice Test

Suffixes that express fullness or abundance attach to a root to mean “full of.” The suffix -ful does that, turning a noun into an adjective that describes being filled with or characterized by that noun—examples include joyful (full of joy), colorful (full of color), and helpful (full of help).

In this question, the suffix that means “full of” is -ful. Other common suffixes here don’t carry that meaning: -ic describes having the nature of or relating to, -ish means somewhat or like, and -ion turns a word into a noun indicating an action or condition.