Because wonderfullest isn't a word. For most adjectives of two syllables or more that don't end in y, the superlative is formed by adding most to the positive.
"Studying" is not a superlative, as it is not an adjective. "Most studious" is a superlative of "studious."
Comparative is more and superlative is most.
The comparative is more punctual; the superlative is most punctual.
more modest, most modest
Comparative = more important Superlative = most important
The comparative of wonderful is "more wonderful". The superlative of wonderful is "the most wonderful."
more wonderful, most wonderful
most wonderful
more wonderful, most wonderful
more wonderful, most wonderful
more wonderful, most wonderful
More wonderful most wonderful
more wonderful, most wonderful
More wonderful and most wonderful
The superlative of terrible would be most terrible.
More wonderful and most wonderful.
There is only one comparative form of wonderful, and it is more wonderful. The superlative form of wonderful is most wonderful.