"engrossing" in the verb sense
1. steep, immerse, engulf, plunge, engross, absorb, soak up
devote (oneself) fully to
"He immersed himself into his studies"
2. absorb, engross, engage, occupy
consume all of one's attention or time
"Her interest in butterflies absorbs her completely"
"engrossing" in the adjective sense
1. absorbing, engrossing, fascinating, gripping, riveting
capable of arousing and holding the attention
"a fascinating story"
Source: WordNet® (An amazing lexical database of English)
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