absorbing

To include so that it no longer has separate existence; to overwhelm; to cause to disappear as if by swallowing up; to incorporate; to assimilate; to take in and use up.

To engulf, as in water; to swallow up.

To suck up; to drink in; to imbibe, like a sponge or as the lacteals of the body; to chemically take in.

Engrossing, that sustains someone's interest.

"An absorbing pursuit."

(of a state) Allowing a process to enter it, but not to leave it.