This is the 5156th most frequent Korean word.
놀라지
"놀라지" means "do not be surprised" or "are surprised" depending on context.
Here, '놀라지' is part of the conjugated verb '놀라지 않았다', which means 'was not surprised'. It forms the negative past tense of 'be surprised'.
그는 갑작스러운 소식에 놀라지 않았다.
He was not surprised by the sudden news.
In this case, '놀라지 말고' is an imperative form implying not to be surprised, instructing or advising someone on their reaction.
너무 놀라지 말고 차분하게 생각하자.
Don’t be too surprised and think calmly.
Here, '놀라지' is utilized as part of the phrase '놀라지 않을 수 없었다', expressing inevitability in being surprised, emphasizing the subject's reaction.