誠せい心しん

noun

sincerity; true heart

A formal, somewhat literary noun for wholehearted sincerity or genuine devotion. Often used in set phrases like 誠心誠意.

• 彼かれは誠せい心しん誠せい意い、問もん題だいの解かい決けつに取とり組くんだ。

  He tackled the problem with utmost sincerity.

• 誠せい心しんをもってお詫わび申もうし上あげます。

  I offer my sincere apologies.