utmost
UK: ˈʌtməʊst | US: ˈʌtmoʊst
adj. of the greatest or highest degree; most extreme
n. the greatest possible amount, extent, or degree
The word "utmost" originated in Middle English as a combination of "ut" (a variant of "out") and "most," literally meaning "outermost" or "farthest out." Over time, its meaning shifted metaphorically to signify the highest degree or extreme limit of something. The logic reflects a spatial concept ("outermost") evolving into an abstract intensity ("greatest possible").
She put in her utmost effort to finish the project on time.
Safety is of the utmost importance in this laboratory.
He pushed himself to the utmost to achieve his goals.
The team worked with the utmost precision to avoid errors.
This task requires the utmost care and attention.