Jisho

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I-adjective (keiyoushi)
1. hard; solid; tough​esp. 固い and 堅い for wood, 硬い for metal and stone
  • たまご卵
  • は
  • かた硬く
  • ゆでて
  • ください
  • 。
Boil the eggs hard.
I-adjective (keiyoushi)
2. stiff; tight; wooden; unpolished (e.g. writing)​
  • この
  • ふた
  • は
  • かた固くて
  • と取れない
  • よ
  • 。
This lid is too tight for me to open.
I-adjective (keiyoushi)
3. strong; firm (not viscous or easily moved)​
  • その
  • きかい機械
  • の
  • ほねぐ骨組み
  • は
  • かた堅く
  • なければならない
  • 。
The frame of the machine should be rigid.
I-adjective (keiyoushi)
4. safe; steady; honest; steadfast​
I-adjective (keiyoushi)
5. certain; assured; highly likely​Only applies to 固い, Only applies to 堅い, of a predicted outcome
I-adjective (keiyoushi)
6. obstinate; stubborn​
  • かた固い
  • こと
  • い言う
  • な
  • よ
  • 。
You don't have to be so formal.
I-adjective (keiyoushi)
7. bookish; formal; stuffy​Antonym: 砕けた
I-adjective (keiyoushi)
8. solid (shape or stones)​Go (game), Only applies to 堅い
Other forms
固い 【かたい】、堅い 【かたい】、緊い 【かたい】
Notes
緊い: Irregular kanji usage.

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