(a.) Unjustly severe in government; imperious; despotic; cruel; arbitrary; as, a tyrannical leader\; tyrannical government.

absolute absolutist absolutistic arbitrary aristocratic arrogant autarchic authoritarian authoritative autocratic bossy brutal despotic dictatorial domineering feudal grinding harsh heavy-handed high-handed imperative imperial imperious lordly magisterial magistral masterful monocratic oppressive overbearing overruling peremptory repressive roughshod severe strict suppressive tyrannous unjust