1. The little boy did not even say thanks when I gave him a gift. How rude is that.2. Bad upbringing is the cause of most youth crime.3. The ill-mannered boy misbehaved in front of the guests and humiliated his parents.4. The poorly disciplined dog was dumped by his owner in the dumpster.
 bad-mannered; ill-mannered uncivilized; vulgar; rude; impolite bad upbringing poorly disciplined很貼切，指野蠻的, 沒有禮貌的，當名詞用. 而 poorly disciplined 可用在小孩或動物，表示不守規矩沒有家教的意思
The thesis of your essay is completely obscured by your flowery langage.