unaccented

adjective4

1. •
   Of a word's sound or of a language, without any stress (accent).
2. •
   Of a person's speech, not pronounced with a distinctive accent.

   • The Frenchman spoke clear, unaccented English.
3. •
   Of a written word, having no accent marks.
4. •
   Of a written word, having no diacritical marks of any kind.