Steady, honest, and thorough; not showy but reliable. Often used to describe persistent, diligent effort (na-adjective/noun).
地道に勉強すれば、少しずつ実力がつく。
If you study steadily, your ability will grow little by little.
彼の成功は地道な努力の積み重ねによるものだ。
His success is the result of accumulated steady effort.
地道な作業が必要だから、焦らずやろう。
Because steady work is required, let's not rush and do it carefully.