1. 形容詞
   免費的, 無償的
   無報酬的, 無端的
   無理由的
   不必要的
   

   同義字詞
   complimentary,costless,free,gratis
   dispensable,inessential,needless,nonessential,uncalled-for,unessential,unnecessary,unwarranted
   

例句

1. After awhile, it became gratuitous .
2. But don't think the violence is gratuitous .
3. Yes , it's gratuitous , not to mention slightly crazy.
4. Complexity and " gratuitous complexity" look the same.
5. Some performance art does contain gratuitous violence.
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