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

 

vaunted

 adjective
adjective
BrE BrE//ˈvɔːntɪd//
 
; NAmE NAmE//ˈvɔːntɪd//
 
[usually before noun](formal)
 
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proudly talked about or praised as being very good, especially when this is not deserved Their much vaunted reforms did not materialize. Word Origin late Middle English: the noun a shortening of obsolete avaunt ‘boasting, a boast’; the verb (originally in the sense ‘use boastful language’) from Old French vanter, from late Latin vantare, based on Latin vanus ‘vain, empty’ + -ed.
See the Oxford Advanced American Dictionary entry: vaunted