unquestionable

形容词 unquestionable:

1. incapable of being questioned
2. not counterfeit or copied
   同义词：authentic, bona fide, veritable
3. not open to question

1. An unquestionable antique.
   毫无疑问的文物
2. His honesty is unquestionable.
   他很诚实，这是毫无疑问的。