Well, my dear—I should say, when he sends you after him all the way to town— [Smiling almost imperceptibly.
[Suppressing an almost imperceptible smile.
There are no more uses of "imperceptible" in the play.
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...and he let the line slip down, down, down, unrolling off the first of the two reserve coils. As it went down, slipping lightly through the old man’s fingers, he still could feel the great weight, though the pressure of his thumb and finger were almost imperceptible.