voracious

voracious   /vres, AM vr-/  
ADJ : usu ADJ n
If you describe a person, or their appetite for something, as voracious, you mean that they want a lot of something.[ LITERARY ]
Joseph Smith was a voracious book collector.
...the band's voracious appetite for fun.
insatiable    
=voraciously ADV
He read voraciously