as to
On the matter
As to introduces the topic or subject something relates to: As to your question about timing, we'll decide tomorrow.
It can express uncertainty or concern about a specific matter: I'm unsure as to whether he'll come.
The phrase often appears where simpler prepositions like "about" or "on" would work: opinions as to the cause means opinions about the cause.
regarding
Causing worry or unease
- aboutConcerning or approximately
- in terms ofConcerning a particular aspect
- on the subject ofRelating to a topic
- in connection withRelating to a matter
concerning
Causing worry or unease
- aboutConcerning or approximately
- in terms ofConcerning a particular aspect
- on the subject ofRelating to a topic
in connection with · vis-à-vis · dealing with · apropos of · respecting
astonish, astute, astound, astonishing, astounding, astounded, astonishment, astuteness, astonishingly