All 3 Uses

gratuitous
in
Tess of the d'Urbervilles
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"Dear father," he said sadly, "I wish you would not expose yourself to such gratuitous pain from scoundrels!"†
Chpt 4 *
To her and her like, birth itself was an ordeal of degrading personal compulsion, whose gratuitousness nothing in the result seemed to justify, and at best could only palliate.†
Chpt 6
They were only women; they were not regular labourers; they were not particularly required anywhere; hence they had to hire a waggon at their own expense, and got nothing sent gratuitously.†
Chpt 6

Definitions:

(1) (gratuitous)
unnecessary and unwarranted

or less commonly (except where it is common in the legal field): costing nothing
(2) (meaning too rare to warrant focus)