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A Macbethian is a selfish, power-hungry person who’d sell their own grandma for a promotion and doesn’t care if they end up alone with nothing but a crown and a bunch of regrets.
My boss is a Macbethian. He fired his best friend for a raise.
That guy stole the last donut and now he’s king of the office.
She got the job, but now she’s the only one left who doesn’t know anyone.