稳固 (wěn gù) is an adjective meaning 'stable' or 'secure', describing something that is firmly established, unlikely to shake, collapse, or change unexpectedly. The first character 稳 (wěn) conveys steadiness, calmness, and balance—like a person standing steadily on solid ground. The second character 固 (gù) means 'firm', 'solid', or 'fixed', often implying durability and resistance to external force. Together, they emphasize both physical stability (e.g., a well-built bridge) and abstract reliability (e.g., a stable relationship or secure system).

This word is commonly used in formal or descriptive contexts: construction, engineering, politics, economics, and personal relationships. It often appears as a predicate adjective ('这座桥很稳固') or as a modifier before nouns ('稳固的基础'). Unlike colloquial terms like 牢 (láo, 'strong/tight'), 稳固 carries a more measured, structural, and enduring connotation—suggesting not just strength but resilience over time.