marplot
/ˈmɑrplɑt/
noun
- A person who spoils or ruins a plan or activity by interfering or making mistakes.
- The team's new member turned out to be a marplot, accidentally deleting important files.
- She tried to help, but her constant suggestions made her a marplot in the kitchen.
- Every group project has one marplot who derails the discussion with off-topic questions.
Antonyms