satisfied face; look of understanding
Describes a facial expression showing that someone has understood and accepted an explanation or situation. Often used when a person's doubts are resolved.
After hearing the explanation, he had a satisfied look on his face.
The students nodded with looks of understanding at the teacher's story.
満足顔 is a satisfied face in general, often from pleasure or contentment, while 納得顔 emphasizes satisfaction from understanding or being convinced.
Compound of 納得 (understanding, acceptance) and 顔 (face).