Example, does "are you whimsical?" translates in to "Sie sind wunderlich?"
Also, does gender matters for the word "you" and verb "to be"?
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Generally, you can translate
Are you adjective?
Bist Du Adjektiv?
Are you young?
Bist Du jung?
The grammatical gender doesn't have an influence in the second person singular. But be aware that (like in English) you have to switch the subject and predicate in a question:
You are young -> Are you young?
Du bist jung -> Bist Du jung?
And as a side note, "wunderlich" might not be the best translation for "whimsical". "wunderlich" has a stronger negative connotation, for example in the range of "quaint", "odd" or "strange". A better translation for "whimsical" might be "launenhaft".