nasty in Korean is 못되다. For examples, you can use like [못된 녀석, 못된 놈]. In this post you will learn how to pronounce and use 못되다 along with examples.
Basics
| Word | Part | Chinese | Sound |
| 못되다 | adjective | — | 몯ː뙤다/몯ː뛔다 |
못되다 Meaning
| Meaning | Explanation |
| nasty; naughty | (for one’s personality or behavior) Morally bad. |
How to Conjugate 못되다
① Formal High (합니다체)
| Present |  못됩니다 |
| Past | 못됐습니다 |
| Past Perfect | 못됐었습니다 |
| Future | 못될 것입니다 |
| Condition | 못되겠습니다 |
② Informal High (해요체)
| Present | 못돼요 |
| Past | 못됐어요 |
| Past Perfect | 못됐었어요 |
| Future | 못될 것이에요 |
| Condition | 못되겠어요 |
③ Informal Low (해체)
| Present | 못돼 |
| Past | 못됐어 |
| Past Perfect | 못됐었어 |
| Future | 못될 것이야 |
| Condition | 못되겠어 |
④ Formal Low (한다체)
| Present | 못된다 |
| Past | 못됐다 |
| Past Perfect | 못됐었다 |
| Future | 못될 것이다 |
| Condition | 못되겠다 |
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