Definition of "interesting"

He indeed had good reason to be offended; for though Dr. Swinfen's motive was good, he inconsiderately betrayed a matter deeply interesting and of great delicacy, which had been entrusted to him in conference […] .

1791, James Boswell, Life of Johnson, Oxford, published 2008, page 48

Comics were just another form of entertainment to me, but it got to be more and more interesting every day.

2015-11-22, Stan Lee, "Marvel's Stan Lee: 'I'd never really thought of doing comics for a living.'", The Guardian

I found myself in a fair way of being a mother; and that I might be near my own relations, in such an interesting situation, I and my dear companion departed from H—n, not without great reluctance […] .

1751, [Tobias] Smollett, The Adventures of Peregrine Pickle […], volumes (please specify |volume=I to IV), London: Harrison and Co., […]

Mrs Lenville (who, as has been before hinted, was in an interesting state) rushed from the rear rank of ladies, and uttering a piercing scream threw herself upon the body.

1838 March – 1839 October, Charles Dickens, The Life and Adventures of Nicholas Nickleby, London: Chapman and Hall, […], published 1839

I'm afraid I seem to make heavy weather of my interesting condition.

1928, WB Maxwell, We Forget Because We Must