Meanings of even ill-usage in English

It may be so murdered, but even ill-usage will more often fail than succeed in that enterprise.

But memory refuses to retain the elements of unhappiness, the constant apprehension, that hung over one like a cloud, of punishment, and even ill-usage.

But yet such quarrels may arise, such mutual antipathy, such acerbity and even ill-usage, that all who know them admit that a separation is needed.