튼튼히

strongly

Explanation

1. strongly
In the manner of being very hard and firm.

2. healthily
In the manner of one's body, bones, teeth, etc., being hard, firm, and healthy.

3. stably; strongly
In the manner of a group or an organization being stable and not easily collapsing,

4. strongly; solidly
In the manner of one's ideology or mind not shaking and being certain.