If something is disconcerting, it disturbs the composure of someone or makes them feel uncomfortable or worried often because of something surprising or unexpected.
The question she, like everyone else, really wants answered, of course, is whether anyone has actually gone blind as a result of LASIK. And the rather disconcerting answer is that no one seems to know...
—VOGUE, October 2004
Something concerning is something that causes concern or worry or something that is troubling.
A concerning 100-day cough has swept through Britain, with doctors warning cases are up by about 3,800 per cent with young babies being most at risk.
—Anders Anglesey, 7 May 2024
