坚固的近义词

牢固láo gù 
[firm;durable;secure;fast; substantial] 坚固,结实

稳固wěn gù 
1. [firm]∶使安稳牢固
2. [stable]∶安稳牢固,不易变动


结实 jiēshí
1.[strong; sturdy; muscular and healthy]强健
2.[tough; durable; solid; not easily breakable; firm]牢固