Personae non gratae are individuals who have been socially ostracized or excluded from a group. This term is often used to refer to people who have been declared unwelcome in a particular place or situation. The two crossword solutions for this term are 'OUTCASTS' and 'PARIAHS'. OUTCASTS are people who have been rejected or expelled from a group, while PARIAHS are individuals who have been socially excluded and are considered untouchable.