Pertaining to or of the nature of a despot or despotism; unlimited; arbitrary; tyrannical: as, a despotic ruler; despotic government or power; a despotic will.
the GNU version of the Collaborative International Dictionary of English
adjective.
Having the character of, or pertaining to, a despot; absolute in power; possessing and abusing unlimited power; evincing despotism; tyrannical; arbitrary.