adj.无偿的，无正当理由(或目的)的，无谓的

The movie included several gratuitous scenes of violence that did not contribute to the plot.
电影里包含了几幕无关紧要的暴力场景，对剧情没有贡献。
He gave her a gratuitous insult, which was completely uncalled for in the situation.
他无缘无故地侮辱了她，这种行为在那种情况下是完全没有必要的。
The company offered gratuitous advice to its customers on how to improve their online security.
公司无偿为客户提供如何提高在线安全的建议。
Her performance was filled with gratuitous gestures that detracted from the overall impact.
她的表演中充满了多余的举动，削弱了整体效果。
The author included gratuitous details about the character's past that didn't advance the story.
作者加入了关于角色过去的一些无关紧要的细节，这些细节对推进故事并无帮助。
The software update came with gratuitous new features that most users found unnecessary.
软件更新带来了一些用户大多觉得不必要的新功能。
He made a gratuitous assumption about her intentions, causing an unnecessary misunderstanding.
他对她的意图做出了无端的假设，导致了一场本可避免的误会。
The book is criticized for its gratuitous use of profanity, which some readers find offensive.
这本书因其不必要地使用亵渎语言而受到批评，有些读者觉得这是冒犯。
The company's policy is to provide gratuitous technical support for the first month after purchase.
公司的政策是在购买后的第一个月内提供无偿的技术支持。
Her speech was peppered with gratuitous jokes that only a few people in the audience understood.
她的演讲中穿插着一些只有少数听众能理解的无关笑话。