arbitrary(unrestrained by law; tyrannical) adjective [UK: ˈɑː.bɪ.trə.ri] [US: ˈɑːr.bə.ˌtre.ri]
despotic(of or pertaining to a despot) adjective [UK: dɪ.ˈspɒ.tɪk] [US: ˌdɪ.ˈspɑː.tɪk]
high-handed(using power or authority without proper consideration for the feelings or rights of others) adjective [UK: haɪ ˈhæn.dɪd] [US: ˈhaɪ ˈhæn.dəd]