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per·turb·ing | \ pər-ˈtər-biŋ 
\
\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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The first known use of perturbing was in 1559
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