1) (adjective) a person like Macbeth
, one without friends or family due to his greed for power and/or lust, a person who has all he/she could wish for except someone to share it with
2) (adjective) to have a heavy influence of a Scottish culture, heritage or way of being
1) The Macbethian King Midas ended up having all the gold he wanted, but nothing to spend it on, or anyone to enjoy it with.
2) After his long trip to Scotland, he came back with a Macbethian accent.