Definition of invaluable adjective from the Oxford Advanced Learner's Dictionary

 

invaluable

 adjective
adjective
BrE BrE//ɪnˈvæljuəbl//
 
; NAmE NAmE//ɪnˈvæljuəbl//
 
 
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extremely useful synonym valuable invaluable information invaluable to/for somebody/something The book will be invaluable for students in higher education. invaluable in something The research should prove invaluable in the study of children's language. compare valuable Invaluable means ‘very valuable or useful’. The opposite of valuable is valueless or worthless. More Like This Words that look like opposites, but aren’t different/​indifferent, interested/​disinterested, famous/​infamous, flammable/​inflammable, savoury/​unsavoury, sensible/​insensible, valuable/​invaluableSee worksheet. Word Familyvalue noun verbvaluable adjectiveinvaluable adjective (valueless)valuables nounExtra examples This technology is invaluable for pupils with poor sight. You will find their help absolutely invaluable. Your support has been invaluable to us.
See the Oxford Advanced American Dictionary entry: invaluable