A cynical leader who believes the ends justify the means and has no qualms about manipulating people should be described as having the trait of Machiavellian
From the question, we are told that the leader has no qualms about manipulating people. We can call this type of leader a Machiavellian leader.
A Machiavellian leader uses tricks and lies to get what he or she wants. Such an individual is known to be mischievous and dishonest.
Hence for a cynical leader who believes the ends justify the means and has no qualms about manipulating people should be described as having the trait of Machiavellian.
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