坚固

堅固
jiāngù
  1. firm
  2. firmly
  3. hard
  4. stable

CEDICT

Entry Composition

1 坚 jiān
  1. strong
  2. solid
  3. firm
  4. unyielding
  5. resolute
2 固 gù
  1. hard
  2. strong
  3. solid
  4. sure
  5. assuredly
  6. undoubtedly
  7. of course
  8. indeed
  9. admittedly