The child had bad manners and was undisciplined in his behaviour, making him difficult to deal with.
undisciplined could mean "wild", so 'tame' could apply undisciplined could mean "uncouth" or "uncultured", so 'demure' or 'genteel' could apply
Why is Nigeria underdeveloped?
the USA, underdeveloped mind wise that is
students today really must find a way to read at least some classical texts
Untamed, feral, undisciplined.
It is undisciplined.
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How Europe Underdeveloped Africa was created in 1972.