坚固 (jiān gù): Firm (Adjective) — Meaning & Stroke Order

This bridge is very sturdy; it has been in use for a hundred years.

The fortress walls are exceptionally sturdy, having withstood centuries of wind and rain and still standing firm.

Are you sure this ladder is sturdy enough to support the weight of both of us?

The foundation of trust between them is very solid, so their collaboration is always highly efficient.