naughty, cause sb. a headache 
knorrig 
nodoso 
knotty 
nudoso naughty, cause sb. a headache 15 伤脑筋 [傷腦-] shāng nǎojīn (hurt-brain) naughty, cause sb. a headache: ~的事情 brainy problem || 选择好大学让人~. Choosing a good university gets on your nerves. '| Goethebuch | Vietnamese |
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