Difference between 보통, 원래, and 주로 when saying “usually”?
In these three sentences what is the difference between these three words?
아침을 보통 안 먹어요.
아침을 원래 안 먹어요.
아침을 주로 안 먹어요?

What’s the main difference between these three words?

Question

Difference between 보통, 원래, and 주로 when saying “usually”?
In these three sentences what is the difference between these three words?
아침을 보통 안 먹어요. 
아침을 원래 안 먹어요.
아침을 주로 안 먹어요?

What’s the main difference between these three words?

Answer

원래 is quite different from 보통 and 주로.

원래 means "originally; primarily; by nature"
보통 and 주로 both mean "usually"
In other words,
보통 means "generally, or normally"
주로 means "mainly, In a manner of serving as a basis or center"
In short,
보통 is used for a matter that happens  a little more frequently than normal. (probability:50~60%)
주로 is used for a matter that happens  much more frequently than normal. (probability:80~90%)

Answer

'보통'   과  '주로'   는  비슷해요.
'원래'   는   조금 더 강합니다.      '전혀 안 먹어요'  ,  '처음부터 안 먹었어요' 의  뜻입니다.