There is no freak exhibitionism here, no perverted striving for novelty, no orgy of unbridled egotism.
Do you care for that sort of unbridled arrogance? I don’t know what one could say for him, unless it’s that he’s terribly good-looking, if that matters.
"The incident illustrates to perfection," wrote Ellsworth Toohey, "the antisocial nature of Mr. Howard Roark’s egotism, the arrogance of the unbridled individualism which he has always personified."
There are no more uses of "unbridled" in the book.
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Wolves are also strict monogamists, and although I do not necessarily consider this an admirable trait, it does make the reputation for unbridled promiscuity which we have bestowed on the wolf somewhat hypocritical.
Farley Mowat -- Never Cry Wolf
It was attached to his saddle, which was cinched around his horse, which, when they stopped, could be subtly unbridled, just enough so that with a fierce tug from her end, the chain would rip the saddle off the beast, he’d tumble to the ground, and she would— She sensed Captain Westfall’s attention.