The need for food when you are starving is an example of something that would be described as being of the utmost importance.
The utmost tip of the peninsula.
A matter of the utmost importance.
Worked every day to the utmost of her abilities.
Origin of utmost
- Middle English from Old English ūtmest ūt out ud- in Indo-European roots -mest -most
From American Heritage Dictionary of the English Language, 5th Edition
- Old English ut (“out") + -most