interesting (special, unusual or exciting in a way that attracting the attention): The movies was really interesting.
fascinating (very interesting or attractive): This place is absolutely fascinating.
compelling formal (interesting or exciting): I found the novel very compelling.
absorbing (very interesting or enjoyable): It was a really absorbing game.
engrossing (holds all the attention or interest): She told me an engrossing story.
stimulating (interesting and full of new ideas or experiences): I found my new job stimulating.
intriguing (very interesting because it is unusual): The discovery gave the scientists an intriguing window into the outer space.
gripping (so interesting that holds the attention): That was a gripping story.