Definition of perturbing
: causing worry, upset, or concern : unsettling
… the absence of mail was somehow just as perturbing as its presence, and it made him feel strangely on edge.— Bentley Little Rowland had an odd feeling … that she might make, later, some perturbing discovery.— Henry James
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Merriam-Webster unabridged
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Time Traveler for perturbing
The first known use of perturbing was in 1559
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