utmost

1. ADJ You can use utmost to emphasize the importance or seriousness of something or to emphasize the way that it is done. 最大的; 极度的[ADJ n] [强调]

It is a matter of the utmost urgency to find out what has happened to these people. 当务之急是弄清楚这些人出了什么事。

Security matters are treated with the utmost seriousness. 安全问题受到极为严肃的对待。

2. N-SING If you say that you are doing your utmost to do something, you are emphasizing that you are trying as hard as you can to do it. 最大努力[强调]

He would have done his utmost to help her. 他本来会尽最大努力帮助她。