1.
clear; lucid; articulate
Describes explanations, arguments, or answers that are easy to understand, logically sound, and free of ambiguity. Used to praise the clarity and directness of communication or reasoning.
明快な回答だった。
It was a clear answer.
Usage: 明快 is used as a positive evaluation of someone's communication, reasoning, or writing style. It is common in book reviews, academic discussion, and journalism.