Translation

• hard to understand
• difficult to deal with
• knotty
• complicated

Synonyms

• 狐疑, 疑义, 疑云, 疑团, 疑案, 疑点, 疑窦, 疑问, 疑阵, 谜, 问号, 问题, 闷葫芦
• 万事开头难, 万难, 为难, 举步维艰, 伤脑筋, 作难, 创业维艰, 别无选择, 千难万难, 吃力, 吃劲, 困难, 大海捞针, 寸步难行, 急难, 患难, 扎手, 来之不易, 棘手, 没法子, 海底捞针, 烦难, 犯难, 积重难返, 繁难, 绕脖子, 缠手, 老大难, 艰难, 讨厌, 谈何容易, 费事, 费力, 费劲, 费工, 费工夫, 费手脚, 费时, 费难, 辣手, 难, 难上加难, 难于, 难于登天, 难人, 难办, 难找, 高难