very tough in Korean is 끈질기다. For examples, you can use like [고기가 끈질기다, 나물이 끈질기다]. In this post you will learn how to pronounce and use 끈질기다 along with examples.
Basics
| Word | Part | Chinese | Sound |
| 끈질기다 | adjective | — | 끈질기다 |
끈질기다 Meaning
| Meaning | Explanation |
| very tough | Tough and being not cut easily. |
How to Conjugate 끈질기다
① Formal High (합니다체)
| Present |  끈질깁니다 |
| Past | 끈질겼습니다 |
| Past Perfect | 끈질겼었습니다 |
| Future | 끈질길 것입니다 |
| Condition | 끈질기겠습니다 |
② Informal High (해요체)
| Present | 끈질겨요 |
| Past | 끈질겼어요 |
| Past Perfect | 끈질겼었어요 |
| Future | 끈질길 것이에요 |
| Condition | 끈질기겠어요 |
③ Informal Low (해체)
| Present | 끈질겨 |
| Past | 끈질겼어 |
| Past Perfect | 끈질겼었어 |
| Future | 끈질길 것이야 |
| Condition | 끈질기겠어 |
④ Formal Low (한다체)
| Present | 끈질긴다 |
| Past | 끈질겼다 |
| Past Perfect | 끈질겼었다 |
| Future | 끈질길 것이다 |
| Condition | 끈질기겠다 |
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