Words you may need
au courant – Being up to particular standard or level especially in being up to date in knowledge
sui generis – Constituting a class of its own; unique
non sequitur – A reply that has no relevance to what preceded it
persona non grata – A diplomat who is unacceptable to the government to which he is sent
quid pro quo – Something for something; that which a party receives (or is promised) in return for something he does or gives or promises
status quo – The existing state of affairs
coup d’état – A sudden and decisive change of government illegally or by force
nom de guerre – A fictitious name used when the person performs a particular social role
mea culpa – An acknowledgment of your error or guilt
de rigueur – Required by etiquette or usage or fashion
bête noire – A detested person
de rigueur – Required by etiquette or usage or fashion
ipso facto – By the fact itself
raison d’etre – Reason for being
inter alia – Among other things
lèse majesté – A crime that undermines the offender’s government
de jure – By right; according to law
de facto – Existing in fact whether with lawful authority or not
Au contraire – used to suggest that the opposite is really the case