Meaning of persona non grata*

per•so•na non gra•ta

Pronunciation: (per-sō'nä nōn grä'tä Eng. p&schwar-sō'n&schwa non grä't&schwa, grā'-, grat'&schwa), [key]
— pl. per•so•nae non gra•tae
  1. a person who is not welcome:persona non grata He has become
  2. a diplomatic representative unacceptable to an accrediting government.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.