I try to explain my ideas and feelings to my brother, but there is no use, for he is very obdurate to change
He was so obdurate, that no amount of persuasion could make him step back from the ledge.
Ebenezer Scrooge was an adamant obdurate, until the ghost's of Christmas past, present & future showed him the error of his way's.
You just did. :) But anyways, you can say: She remained obdurately in the same place.
(The words may be part of separate clauses, or the letter I could specifically refer to the letter of the alphabet. Otherwise, the proper conjugation is "am.")Examples:The one that I like the best is...
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