arriere pensee vs mental reservation

arriere pensee and mental reservation both are nouns.

Word	Noun	Adjective	Verb	Adverb
arriere pensee	Yes	No	No	No
mental reservation	Yes	No	No	No

As nouns, arriere pensee and mental reservation are synonyms defined as:

arriere pensee and mental reservation: an unstated doubt that prevents you from accepting something wholeheartedly

Other synonyms of arriere pensee include reservation.

arriere pensee (noun)	mental reservation (noun)
an unstated doubt that prevents you from accepting something wholeheartedly	an unstated doubt that prevents you from accepting something wholeheartedly