engrossing

(verb) devote (oneself) fully to. Synonyms: steep, immerse, engulf, plunge, engross, absorb, soak up. Example: "He immersed himself into his studies."

(verb) consume all of one's attention or time. Synonyms: absorb, engross, engage, occupy. Example: "Her interest in butterflies absorbs her completely."

(adj) capable of arousing and holding the attention. Synonyms: absorbing, fascinating, gripping, riveting. Example: "A fascinating story."