단단하다

1. hard
An object being hard enough not to be changed by a certain force.

2. hard; solid
Evenly solid, not weak or mushy.

3. firm
Full and useful.

4. solid; tight; firm
Strong, not loose.

5. durable
A will or thought being strong without being shaken.

6. more serious; more severe
A degree being more severe than normal.

7. sure
Done surely without a mistake.

8. solid; strong
The ground for something being strong.

9. reliable; strong-willed
Someone being smart and strong-willed.