unimpeachable meaning, unimpeachable definition | English Cobuild dictionary

Collins

unimpeachable  

  
If you describe someone as unimpeachable, you mean that they are completely honest and reliable.  
FORMAL      adj  
He said all five were men of unimpeachable character., ...an unimpeachable source.     
Translation English - Cobuild Collins Dictionary  
Collins

unimpeachable  

  
above reproach, beyond criticism, beyond question, blameless, faultless, impeccable, irreproachable, perfect, unassailable, unblemished, unchallengeable, unexceptionable, unquestionable  
  
Antonyms     
   blameworthy, faulty, imperfect, reprehensible, reproachable, shameful  

English Collins Dictionary - English synonyms & Thesaurus  

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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"