adverb
Above/beyond suspicion is an adverb phrase that modifies the verb 'is', indicating the degree to which something is beyond doubt or suspicion.
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The CEO's integrity is above suspicion, as he has always acted with the utmost honesty and transparency.
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I trust her completely, she's above suspicion.
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No one can touch him, he's beyond suspicion.
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Her reputation is so pristine, it's like she's floating above suspicion.