This is the 4432nd most frequent Japanese word.
堅実
Reliable, solid, or practical.
Here, '堅実' is used to describe someone's personality as solid, stable, and sensible.
彼は堅実な性格で、状況に基づいた判断をします。
He has a reliable personality and makes decisions based on circumstances.
In this sentence, '堅実' refers to plans that are practical, well-thought-out, and reliable.
堅実な計画を立てることで、成功の可能性が高まります。
By making solid plans, the likelihood of success increases.
In this context, '堅実' is used to indicate the growth is stable, reliable, and assured.