전혀 + negative: 전혀 몰라요, 전혀 안 아파요
(not) at all, (not) in the least
Example
저는 그 사람을 전혀 몰라요.
I don't know that person at all.
Word parts
전 whole
From 'whole': wholly, used to mean 'not at all' with negatives.
Good to know
Always pair 전혀 with a negative like 안, 못, 없다, or 모르다.
Related words