bestやbetterやwellの用法
文法と代名詞の指すものが分からない
http://okwave.jp/qa/q8073983.html
で質問した文章なのですが、別の箇所で質問させていただきたいことが出てきました。
Most children do not like to hear stories about when they were younger. Infancy is not a blessed state to them, but something to be grown out of and escaped from as quickly as possible. To them, their littleness, helplessness, and clumsiness is not cute, but humiliating, and they want to be reminded of it as little as possible. They don't mind, once in a while, if we don’t overdo it, our telling them that they were very nice when they were little, but that is about as much about it as they want to hear. Whatever mistakes they have made, in their growing and learning, are best forgotten.
の最後の文の
Whatever mistakes they have made, in their growing and learning, are best forgotten.
のbestの用法が分かりません。
当初はbestが名詞でforgottenが後置修飾の形容詞と読んでいたのですが、冠詞がないので、bestは副詞であることに気づきました。
他の例文として
That is best refused.
それは断るのが一番いい
They are better avoided.
それは避けたほうが良い。
A friend is best found in adversity.
友達は逆境において最もよく見出される
It has been well said that haste makes waste.
誤:急いては事を仕損じると今までよく言われてきた
正:急いては事を仕損じると言われているが、これはまさに至言である。
これらのbestやbetterやwellの用法なのですが、調べた範囲では分かりませんでした。
いったいどういう用法なのでしょうか。