unspoil

verb

1. (transitive)To make less spoiled.

   “The week before, watching her work, Logerwell had called out to her, "I can tell you right now, if you mollycoddle a horse he'll turn out spoilt, and I've had to unspoil plenty of horses that've been girl-broke. […]”

   “A few negative people can ruin an entire office environment, which shows you how powerful negativity is. It is so bad, even positive workers can't “unspoil” it.”

   “As John grew into a toddler he was quite spoilt, so I took the serious responsibility of unspoiling him.”