causing or tending to cause annoyance, frustration, or worry 引起烦恼的;令人沮丧的;令人讨厌的 the vexatious questions posed by software copyrights. 软件版权带来的令人恼火的问题。 ■(Law)denoting an action or the bringer of an action that is brought without sufficient grounds for winning, purely to cause annoyance to the defendant (律)无理缠讼的,无理取闹的