kibbitzer

/ˈkɪbɪtsər/
noun
  1. A person who gives unwanted advice or comments, especially while watching others do an activity.
    • The old man was a friendly kibbitzer at the chess club, always offering tips to the players.
    • My uncle is a terrible kibbitzer when I'm trying to fix my car; he just stands there telling me what to do.
    • The online forum was full of kibbitzers who criticized the artist's work without ever picking up a brush.
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