groveller

/ˈɡrɑvələr/
noun
  1. A person who behaves with excessive humility or submissiveness, especially to gain approval or forgiveness.
    • No one respected the groveller who apologized for things that weren't his fault.
    • The groveller in the group always agrees with the loudest person.
    • He was a groveller, constantly flattering his superiors.
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