Nisi Dominus frustra.—Unless the Lord be with us, all efforts are in vain.
Noblesse oblige.—Rank imposes obligation.
Nolens volens.—Willing or unwilling.
Noli me tangere.—Don’t touch me.
Nolle prosequi.—Unwilling to proceed.
Nolo episcopari.—I am not willing to be made a bishop (an old formal way of declining a bishopric.)
Nom de guerre.—An assumed name.
Nom de plume.—A literary title.
Nomen et omen.—Name and omen; a name that is ominous.
Non compos mentis.—Not of sound mind.