How do you say the words "formal" and "informal" in Vietnamese?
I'm preparing a list of basic phrases for my friend in Slovak with Vietnamese translations and I want to put in brackets if they are used in formal or informal situation.
Thank you in advance!

Question

Answer

formal = theo hình thức

informal = không theo hình thức .

There may be a better way to say "informal".  I just negate "formal" by placing a "not" in front of of it.