All 9 Uses of

capricious
in
The Brothers Karamazov

I knew a young lady of the last "romantic" generation who after some years of an enigmatic passion for a gentleman, whom she might quite easily have married at any moment, invented insuperable obstacles to their union, and ended by throwing herself one stormy night into a rather deep and rapid river from a high bank, almost a precipice, and so perished, entirely to satisfy her own caprice, and to be like Shakespeare's Ophelia.†
Chpt 1

caprice = impulsiveness or unpredictability

I do not know the details, but I have only heard that the orphan girl, a meek and gentle creature, was once cut down from a halter in which she was hanging from a nail in the loft, so terrible were her sufferings from the caprice and everlasting nagging of this old woman, who was apparently not bad-hearted but had become an insufferable tyrant through idleness.†
Chpt 1

And no wonder, Lise, no wonder ...your caprices will make me hysterical too.†
Chpt 4

caprices = instances of impulsiveness or unpredictability

Ah, your caprices, Lise, your fidgetiness, your illness, that awful night of fever, that awful everlasting Herzenstube, everlasting, everlasting, that's the worst of it!†
Chpt 4

Let us go, Alexey Fyodorovitch, she is too capricious to-day.†
Chpt 4

capricious = impulsive or unpredictable

These spoilt fine ladies, if they set their hearts on anything, will spare no expense to satisfy their caprice.†
Chpt 8

caprice = impulsiveness or unpredictability

As a rule he was very willful, even capricious, though always friendly.†
Chpt 8

capricious = impulsive or unpredictable

All of us knew that the prosecutor received Mitya against his will, solely because he had somehow interested his wife—a lady of the highest virtue and moral worth, but fanciful, capricious, and fond of opposing her husband, especially in trifles.†
Chpt 12

Definition:

impulsive or unpredictable or tending to make sudden changes -- especially impulsive behavior