Regarding the weather, … Concerning the weather, … Four other random usage examples: An Essay Concerning Regarding Human Understanding Treaty Between France and Spain Regarding concerning Morocco The Question Concerning Regarding Technology Protests regarding concerning the Russo-Georgian War Aren’t all those unconditionally interchangeable?
This is the second sense in Merriam-Webster: concerning (2 of 2) adjective : causing concern or worry : creating reason for concern : TROUBLING "It's extremely concerning that drivers still choose to give their attention to things other than the road when they're behind the wheel," said [Texas Department of Transportation] Executive Director James Bass. —The Nueces County Record Star This ...
Concerning and apropos of also mean the same as with regard to. The Oxford English Living Dictionaries defines it in the following way, that shows that apropos of, with reference to, and concerning have the same meaning: with reference to; concerning I know that there is distinction in preposition choice, as in: with reference to . . .
@NigelJ, I've included the meanings of these three words on my question, but as you can see, Cambridge Dictionary says that the words Concerning and Regarding are actually synonyms.
The Macmillan Dictionary regard touching as a formal preposition, and other dictionaries nearly related the prepositions concerning, about, touching as synonyms. So is it fine to use all of three
All these expressions are synonymous with each other without much difference in meaning. regarding (preposition) Synonyms: concerning, as regards, with regard to, in regard to, with respect to, in respect of, with reference to, relating to, respecting, as for, as to, re, about, apropos, on the subject of, in connection with Usage note: Although sometimes considered poor substitutes for about ...