| 牢 | hitoya katai | prison; stable, pen; secure |
| 臤 | katai | hard; wise |
| 侄 | katai oroka todomaru | nephew |
| 固 | katameru katame katai | to become solid, solidify; strength |
| 劼 | tsutsushimu katai tsutomeru | be discreet, prudent, cautious |
| 俓 | isogu wagi nahoi katai | straight; pass |
| 砝 | katai | balance weights |
| 堅 | katai kataku | hard, strong, firm; resolute |
| 掔 | katai | sturdy |
| 犀 | sai katai surudoi | rhinoceros; sharp, well-tempered |
| 硬 | katai | hard, firm, strong; obstinate |
| 塙 | katai hanawa | truly |
| 確 | tashika katai tashikameru | sure, certain; real, true |
| 鞏 | katai | bind; firm, secure, strong |
| 嬛 | katai | apt, clever; sycophant, flatterer |
| 艱 | nayamu katai | difficult, hard; distressing |
| 難 | katai muzukashii | difficult, arduous, hard; unable |