This is the 9464th most frequent Japanese word.
端的
Concise; straightforward; clear-cut.
Here, '端的' (tanteki) is used to mean 'plainly' or 'concise' to introduce a direct statement.
端的に言うと、それは誤解です。
To put it simply, that is a misunderstanding.
'端的' here grants the action of understanding a quality of clarity and succinctness, emphasizing importance in doing so.
問題を端的に把握することが重要です。
It is important to grasp the issue clearly and concisely.
In this sentence, '端的' describes the quality of being succinct and straightforward in the explanation.