| # | Kanji | Kanji Level 3 | |||
| 398 | 苦 | to suffer; bitter | 921 | ||
| 苦い | nigai | bitter | 2130 921 | ||
| にがて | 苦手 | nigate | poor (at), weak (in), dislike (of) | ||
| くるしい | 苦しい | kurushii | painful | 1976 921 | |
| 苦しめる | kurushimeru | to agonize | |||
| くろう | 苦労 | kuroo | troubles; hardships | 921 2060 | |
| くつう | 苦痛 | kutsuu | pain, agony | ||
| じゅうく | 重苦 | juuku | intense suffering; great [severe] hardship |