obdurate
used in Leaves of Grass

only 1 use

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Definition

stubbornly persistent — especially in wrongdoing

or more rarely (except in classic literature):

showing unfeeling resistance to tender feelings

The place is august, the terms obdurate.
Book 23 — By Blue Ontario's Shore.... (52% in)

There are no more uses of "obdurate" in Leaves of Grass.

Typical Usage (best examples)