How to say "Understanding" in Japanese

When translating "understanding" into Japanese, you must choose carefully between 納得 and 了解. In Japanese, 納得 (なっとく (nattoku)) is typically associated with "understanding, acceptance, consent" (Syllabus Level: N3) and represents To understand and agree with something, or to be convinced. Often used with する. On the other hand, 了解 (りょうかい (ryōkai)) maps to "understanding; agreement; 'Roger that!'; 'Understood.'" (Syllabus Level: N3) and represents Used to express understanding or agreement, often in a more casual or direct context than 承知しました. A literal translation of "understanding" can often sound unnatural to native Japanese speakers if mixed up!