Engrossing
/ɛnˈɡɹəʊsɪŋ/
verb
To write (a document) in large, aesthetic, and legible lettering; to make a finalized copy of.
To buy up wholesale, especially to buy the whole supply of (a commodity etc.).
To monopolize; to concentrate (something) in the single possession of someone, especially unfairly.
Synonyms: amound, hoard, corner the market, inspissate
noun
The act of one who engrosses, or buys up wholesale.
adjective
Utterly consuming one's time and attention.
“an engrossing documentary”
Synonyms: absorbing, fascinating