tinpot

/ˈtɪnˌpɑt/
adjective
  1. Having little importance, power, or skill; petty or second-rate.
    • The company was run by a tinpot manager who knew nothing about business.
    • They called him a tinpot leader because he couldn't make any real decisions.
    • He acted like a tinpot dictator, bossing everyone around in his small office.
Antonyms