There are no adjectives beginning with the letter z that describe a shy person.
zany !
There are thousands of adjectives in the English language. It would take pages and pages to list them all. You could look through a dictionary for examples of adjectives. A good dictionary will list the parts of speech along with a word's definition.
They are not adjectives. Adjectives describe a word.
zealous
horizontal, zébré, zazou, azimuté
zaftigzanyzappedzappyzealouszerozestfulzestyzingyzippyzonked
icyjumpykindlumpymaniacalnewoptimisticpopularquietrambunctioussoftturbulentuglyvaguewetxenophobicyouthfulzesty
The word wish does not have a lot of adjectives to relate with. However two examples of adjectives for this word are : wishful, and wishless.
Adjectives rarely have the ability to begin with the word one....I think you got adjectives confused with "Adverbs"....
ambitiousbrilliantcourteousdecisiveenergeticfearlessgeneroushumbleindustriousjovialkindheartedlikeablemodestneighborlyoptimisticpragmaticquietreliablesincerethoughtfulunselfishvigilantwittyxenophobicyouthfulzealous
adjectives are describing words and adverbs are the word when,where and who.