стабильным

стабильным

Stable.

The word 'стабильным' in this sentence is used as an adjective in its instrumental case, describing the condition of 'здоровье' (health).

Его здоровье осталось стабильным после операции.

His health remained stable after the surgery.

Here, 'стабильным' appears as an adjectival predicate in its instrumental form, reflecting a state or quality of the undefined subject 'one' related to work.

Чтобы быть более стабильным в работе, нужно иметь больше опыта.

To be more stable in work, one needs more experience.

In this case, 'стабильным' is again an adjectival predicate in its instrumental form, used to describe the long-lasting attribute of the structural integrity of the bridge.

Этот мост был построен таким образом, чтобы оставаться стабильным даже во время землетрясений.

This bridge was built in such a way as to remain stable even during earthquakes.