All 3 Uses

capricious
in
Story of My Life
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Mildred and I grew into each other's hearts, so that we were content to go hand-in-hand wherever caprice led us,
Chpt 2 *

caprice = impulse (whim or sudden desire)
There is nothing more beautiful, I think, than the evanescent fleeting images and sentiments presented by a language one is just becoming familiar with—ideas that flit across the mental sky, shaped and tinted by capricious fancy.†
Chpt 16

capricious = impulsive or unpredictable
But "there is nothing more capricious than the memory of a child: what it will hold, and what it will lose."†
Chpt 21

Definitions:

(1) (capricious)
impulsive or unpredictable or tending to make sudden changes -- especially impulsive behavior
(2) (meaning too rare to warrant focus)