Which preposition to use with nonchalant

about Occurrences 1%

The great hall had seemed familiar to her already as she stepped across it on her way to the stairs, her feet had pressed the rugs with assurance, she had been able to be quite nonchalant about refusing the services of the maid who offered to help her dress.

as Occurrences 1%

She was as nonchalant as he.

of Occurrences 1%

Immaculately dressed, scented and befrilled, haughty of manner and nonchalant of speech, M. Rochez had the word "adventurer" writ all over his well-groomed person.

with Occurrences 1%

His face, with as much delicacy and brilliancy as a woman's, was at once handsome, thoroughbred, languid, nonchalant with a certain latent recklessness, under the impassive calm of habit.

Which preposition to use with  nonchalant