— invaluableness , n. — invaluably , adv.
/in val"yooh euh beuhl/ , adj.
beyond calculable or appraisable value; of inestimable worth; priceless: an invaluable art collection; her invaluable assistance.
[ 1570-80; IN- 3 + VALUABLE, in obs. sense "capable of valuation" ]
Syn . precious.
Ant . worthless.