坚牢

Traditional form:

堅牢

Pinyin (reading):

jiānláo

Definitions:

• strong
• firm

Characters:

• 坚 - hard, strong; firm, resolute
• 牢 - pen, prison, stable; fast, firm, secure

Traditional characters:

• 堅 - hard, strong; firm, resolute
• 牢 - pen, prison, stable; fast, firm, secure