stifler

/ˈstaɪflər/
noun
  1. A person or thing that prevents something from happening, growing, or being expressed.
    • That rule is a stifler of free speech in the classroom.
    • Fear can be a stifler of ambition if you let it control you.
    • The new manager was a stifler of creativity, always rejecting new ideas.
Antonyms
What does "stifler" mean? | whatsthatwordmean | whatsthatwordmean