Greediness; the quality of wanting more than one needs, or a person who is greedy.
彼は欲張りで、いつも人の分まで取ってしまう。
He's greedy and always takes more than his share.
欲張りすぎるとチャンスを逃すことがある。
Being too greedy can sometimes make you miss opportunities.
子どもが欲張りになるのは成長の一部だが教える必要がある。
Children becoming a bit greedy is part of growing up, but it needs to be taught/managed.