All 6 Uses

arbitrary
in
The Magic Mountain
(Auto-generated)

He was thirteen years old, a seventh-grader in short pants, and he was standing in the schoolyard talking with another boy about his age, but from a different class—a conversation that Hans Castorp had initiated more or less arbitrarily and that delighted him no end, although it would be a short one, given the limited scope offered by the physical object under discussion.†
Chpt 4.5

arbitrarily = in a manner based on chance or impulse
If so, we needed some light for it—please forgive my arbitrarily taking care of the matter," he said, waving one small hand toward the ceiling lamp.†
Chpt 5.1
I used it quite arbitrarily, simply because my head is a little muddled.†
Chpt 6.7
Forgive me, Mynheer Peeperkorn, for having arbitrarily completed your sentence.†
Chpt 7.4
Fine, no one else had anything better, so let the spirit share this arbitrary item from the fullness of its knowledge.†
Chpt 7.8 *

arbitrary = based on chance or impulse
And scientific accuracy likewise prohibited even thinking of engaging in any such arbitrary departure and return.†
Chpt 7.8

Definitions:

(1) (arbitrary)
based on chance or impulse (rather than upon reasoning, consistent rules, or a proper sense of fairness)
(2) (meaning too rare to warrant focus)