Some adverbs help intensify what you're saying.
His behavior at the meeting was quite inappropriate.
It's totally unacceptable to criticize your superiors.
Your criticism of him was overly direct.
Some adverbs, on the other hand, help soften what you're saying.
This is a rather quiet office. Try to keep the noise down.
Hugging is fairly uncommon in this culture.
Actually, I thought the joke was somewhat rude.
*In British English, quite is sometimes used to soften or qualify what someone is saying. In American English, quite usually means the same as very.
Slapping someone on the back here is quite rude, but not very rude.