This is the 1180th most frequent Korean word.
않았고
"Did not" or "and did not" (past tense negative form).
The word '않았고' is used here to indicate a negation of an action (didn't eat) and connects it to another clause using '-고' (and).
그는 식사를 하지 않았고 그냥 나갔습니다.
He didn't eat and just left.
In this sentence, '않았고' negates the action of considering or worrying about something and uses '-고' to connect it with the consequence (decision-making).
그 일에 대해 고민하지 않았고, 그냥 쉽게 결정을 내렸습니다.
He didn't think about the matter and made a decision easily.
Here, '않았고' negates the act of exercising and utilizes '-고' to connect it to a second negation concerning health care.