Synonym: dear, precious, priceless, worthwhile. Antonym: valueless. Similar words: valuable, invariable, evaluate, evaluation, invalid, invalidate, invariably, inviolable. Meaning: [ɪn'væljʊəbl] 
adj. having incalculable monetary, intellectual, or spiritual worth.
adj. having incalculable monetary, intellectual, or spiritual worth. 
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211. Fossil plants are considered as direct evidence for vegetation succession in the geological period and invaluable materials for the prediction of palaeoelevation.
212. Taking more than one old school tie or hula-girl grass skirt will make you an invaluable person to know.
213. The directory stack functionality is a good example; it becomes invaluable when you want a quick method of visiting a directory without losing your train of thought.
214. A testimonial can be invaluable in selling a product or generating widespread support for an activity.
215. The Keck Observatory has been invaluable in detecting extrasolar planets, worlds around other stars that were long postulated but only detected in the last dozen years or so.
More similar words: valuable, invariable, evaluate, evaluation, invalid, invalidate, invariably, inviolable, invulnerable, in vain, invade, value, invasion, convalesce, face value, squabble, undervalue, convalescence, invincible, invisible, able, fable, table, cable, viable, unable, gabled, notable, stable, liable.