interesting

Etymology

From interest + -ing.

adj

1. (obsolete) Of concern; affecting, important.
   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
2. Arousing or holding the attention or interest of someone.
   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
3. (euphemistic) Pregnant.
   I'm afraid I seem to make heavy weather of my interesting condition. 1928, WB Maxwell, We Forget Because We Must

verb

1. present participle and gerund of interest