malcontent
noun /ˈmælkəntent/
  /ˌmælkənˈtent/
[usually plural] (formal, disapproving)- a person who is not satisfied with a situation and who complains about it, or causes trouble in order to change it不满者;牢骚满腹的人;反叛者 - The strike was engineered by a handful of malcontents.这次罢工是由一小撮不满分子策划的。 
 词源late 16th cent.: from French, from mal ‘badly, ill’ + content ‘pleased’.
- The strike was engineered by a handful of malcontents.