The Collaborative International Dictionary
Invaluably
Invaluably \In*val"u*a*bly\, adv.
Inestimably.
--Bp. Hall.
Wiktionary
invaluably
adv. In an invaluable manner; inestimably.
Usage examples of "invaluably".
Steven Hopp, Emma Hardesty, Frances Goldin, Terry Karten, Sydelle Kramer, and Lillian Lent read and commented invaluably on many drafts.
The single mixer tap was a brilliant, invaluably useful and ingeniously simple innovation.