The correct answer is -a root word, where -un is a prefix. Suffix is used after the stem of a word, and prefix is used before the stem. They both belong to the category of affixes. Some other examples might be ‘uncertain’ , ‘unrealistic’ , ‘unfit’ and so on.
The word "unhappy" is formed by the prefix "un" (meaning "no") and the root "happy".
<u>Morphology </u>is the branch of linguistics that studies the structure within words. In this morphological process, the suffix "ness" can also be attached to the word "unhappy" to form "unhappiness". As we can see, each part of the word encodes meaning.
