Rapidly or speedy.
or
jahemum
function
trapeze
The word 'quick' is a noun when it refers to the bed of a fingernail, the outermost living layer under the nail.Otherwise, 'quick' is an adjective, a word used to describe a noun. The word 'quick' sometimes used as an adverb instead of quickly.The colloquial use means "living" (e.g. the quick and the dead).
The adverb form is "quickly." *In some cases, as with "fast" the word quick may appear instead of quickly, e.g "Come quick" instead of "Come quickly."
Instead of using the word challenging you can use the word gifted, special, special gifted.
or
Will, when, why, it, can
He answered the question quickly and accurately.
A suitable word to use instead of "suddenly" is "unexpectedly." It conveys a sense of an event occurring without warning or anticipation. Other alternatives include "abruptly" or "instantly," which also capture the idea of something happening quickly and without notice.
Myself
I have a stomach ache.
mixture
are
It could be used like... "The penguin's short legs didn't allow him to run quickly, so instead he moved with a funny waddle."
She quickly changed her wig before the cops arrived.