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I am writing a report about someone and would like to convey the sense that he was desperate for success and overly ambitious. I've used phrases like "stop at nothing" to capture the ambition and the willingness to do set aside morals and/or break the law. I would like to use different expressions as I think "stop at nothing" is a bit cliche.

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So let me get this straight: you want a different cliche to use instead of this one? – Robusto Mar 27 '13 at 19:48
@Robusto yes people do that sometimes – user53008 Oct 29 '15 at 21:02
up vote 5 down vote accepted

There are a few questions on this site with helpful terms including this one: "Steamroller" to describe a person as very determined

"Unstoppable" is very straightforward

"Relentless" is good too as is the related "unrelenting"

Definition of "relentless" from the Merriam-Webster online dictionary: showing or promising no abatement of severity, intensity, strength, or pace : unrelenting


Since the OP refined the definition in the comment, below, I think "driven", "irrepressible" and "ruthless" work very well also.

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steamroller doesn't work for me, I'm describing someone engaged in acts of subterfuge and willing to backstab. He is a small screw in a large organization if you will, definitely not a dominant steamroller. – user53008 Mar 27 '13 at 18:41

intractable, maybe, although it means more unmanageable.

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It's an excellent term, but intractable has a different meaning to the one asked for. – Mari-Lou A Nov 20 '14 at 11:29

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