invaluable

[in-val-yoo-uh-buhl]
adjective
beyond calculable or appraisable value; of inestimable worth; priceless: an invaluable art collection; her invaluable assistance.

Origin:
1570–80; in-3 + valuable, in obsolete sense “capable of valuation”

invaluableness, noun
invaluably, adverb


precious.


worthless.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
invaluable (ɪnˈvæljʊəbəl)
 
adj
having great value that is impossible to calculate; priceless
 
in'valuableness
 
n
 
in'valuably
 
adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

invaluable
1570s, from in- "not" + value "estimate the worth of" + -able.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Priceless may either mean invaluable or of no value.
The area's immense variety of fish and resistance to coral bleaching make it an
  invaluable marine wilderness.
Learn how technology today can help protect this invaluable resource.
Such adaptive traits are invaluable not only to local farmers but also to
  commercial breeders elsewhere in the world.
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