ADJ as to wh
The 'curious' group
These adjectives indicate that someone is puzzled or interested by something.
We were naturally curious as to why our father's family had black, curly hair and a darker complexion.
I pause, intrigued as to how a Serbian church became part of such a quaint English village.
The preposition as to is sometimes followed by a noun group.
at a loss baffled bemused bewildered curious fascinated intrigued mystified perplexed puzzled
He brought us here on purpose. I confess I am baffled as to his reason.