The suffix is added to a proper noun.
From the given context:
CompletelyCarefullyLooselyideallyespeciallyfinallyadditionallycertainlybarelyscarcelydirectlyHere the highlighted words are known as suffix. The English grammar is amorpheme added at the end of a derivative. The best examples for suffix are able, al, er, est, ful, ible ,fy, ing, ation etc. For example hopeless, heroic, iconic, creatable.
Suffix can also be used in names such as JR, DR, Mrs., MS.
The suffix is followed by the last name of the person. It acts as the secondary piece of the given information. We can add a group of letters to the end of any sentence or words.
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The general rules for suffix is not followed in the question they are:
The consonants must be double. The vowels should sound short and finally the suffix must start with base words has a silent "e".