When anybody entered the room, she uttered a shshshsh so sibilant and ominous, that it frightened the poor old lady in her bed, from which she could not look without seeing Mrs. Bute’s beady eyes eagerly fixed on her, as the latter sat steadfast in the arm-chair by the bedside.
—William M. Thackeray Vanity Fair (1917)
sibilant - vocabulary
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Ed Good — Grammar Tips