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- Before long there came the sound of hoofs, at first hardly more than a tremor of the ground perceptible only to Aragorn as he lay upon the grass, then growing steadily louder and clearer to a quick beat.3.5 -- Book 3 Chapter 5 -- The White Rider (91% in)
- Hardly perceptibly his head moved to the left and the right, and first one eye and then the other opened a slit.4.1 -- Book 4 Chapter 1 -- The Taming of Smeagol (86% in)
- At the same moment the stirring of the air became perceptible to them; and it grew very cold.4.2 -- Book 4 Chapter 2 -- The Passage of the Marshes (61% in)
There are no more uses of "perceptible" in The Two Towers.
Typical Usage (best examples)