This is the 1193rd most frequent Japanese word.
納得
Understanding; consent; agreement; conviction.
Used as a verb ('納得する') to mean 'to understand or agree to' after gaining clarity.
彼の説明を聞いて、私はやっと納得しました。
After hearing his explanation, I finally understood.
Used to describe a state ('納得のいかない') indicating dissatisfaction or disagreement, showing psychological acceptance.
納得のいかない結果だったので、先生に聞き直しました。
It was a result that I couldn't accept, so I asked the teacher again.
Used to express a convincing or satisfactory ('納得のいく') idea or reason, emphasizing logical or practical acceptance.