도통 + negative (도통 모르겠어요, 도통 연락이 없어요)
(not) at all, (not) in the least
Example
요즘 입맛이 없어서 도통 못 먹겠어요.
I have no appetite these days, so I can't eat at all.
Word parts
도 all+통 whole
Literally 'all together'; now mostly '(not) at all'.
Good to know
Used with negatives: 도통 모르겠어요 'I have no idea at all.'
Related words