What does "tyrannical" mean?

Tyrannical: Of or pertaining to a tyrant; suiting a tyrant; unjustly severe in government; absolute; imperious; despotic; cruel; arbitrary; as, a tyrannical prince; a tyrannical master; tyrannical government. "A power tyrannical." Shak. Our sects a more tyrannic power assume. Roscommon. The oppressor ruled tyrannic where he durst. Pope. -- Ty*ran"nic*al*ly, adv. -- Ty*ran"nic*al*ness, .