誠実

1. Origins, structure, and basic meaning

• Structure: 誠実, read せいじつ, combines sincerity 誠 with truth or substance 実 to express a trustworthy attitude.
• Basic usage: It modifies a noun as in 誠実な態度 or describes manner as in 誠実に答える.

2. Common pitfalls and similar expressions

• Grammar and combinations
  • It focuses on honesty, sincerity, and trustworthiness more than simple diligence 勤勉.