It is a adjective relating to someone using euphemisms. So someone could be "euphemistically speaking".
ASBESTOS
Euphemistically called 'natural causes, or "no others are being sought".
Hades was brutal. Also,he was sometimes euphemistically called Plouton(wealth-giver)
That is the correct language. But if by formal, you mean euphemistically, you ask to "be excused briefly." Everyone will know what you mean.
Arrogance, usually euphemistically called Manifest Destiny.
No, in the accepted vernacular of his day, Dr. Martin Luther King, Jr. was black, what is euphemistically referred to by many today as African American.
The Japanese-American internment was euphemistically referred to as "War Relocation Camps" which was one way of calling what were essentially concentration camps .
If you mnean simply sleeping in the same room or bed as your father, then yes, it is perfectly acceptable, especially if you are younger. However, if you are euphemistically referring to sex, then no, it is very much not acceptable for several reasons.
"Japanese-American internment" where US citizens sere forcibly relocated into what was euphemistically referred to as "War Relocation Camps" : Executive Order 9066 .
"High" rhetoric typically refers euphemistically to an argument, or saying things that may lead to an argument or a fight. To lower the rhetoric means to bring it to a more neutral and less conflict-inspiring level.
There is no such language as "Muslim". In Arabic, there is an expression "Walla" (والله), which is used euphemistically to mean "I swear to God". However, it is not exclusive to Muslims. Arab-speaking Jews, Christians, and Baha'i all use this expression as well.
Neville Chamberlain was forced to resign at the beginning of WW2. Churchill was considered by all parties in Parliament as the least bad alternative, and elected him to lead a coalition Government, euphemistically referred to as the 'government of national Unity'.