high handedly

/haɪ ˈhændɪdli/
adverb
  1. In a way that uses power or authority unfairly, arrogantly, or without considering others.
    • He high-handedly took control of the project and ignored everyone's suggestions.
    • The principal high-handedly canceled the event without asking the students.
    • The landlord high-handedly raised the rent without any notice.