impeccable

adjective2

1. •
   Perfect, without faults, flaws or errors

   • He grew up in Norway, but he writes impeccable English.
2. •
   Incapable of wrongdoing or sin; immaculate

   • It was easy for James V to imprison Lady Glamis, but actually convicting her was far more difficult; her character was impeccable and she was highly respected by all who knew her.