utmost
noun
the greatest possible degree
“he tried his utmost”
adjective
of the greatest possible degree or extent or intensity
“extreme cold”
“extreme caution”
highest in extent or degree
“to the last measure of human endurance”
“whether they were accomplices in the last degree or a lesser one was...to be determined individually”
Synonymslast(comparatives of `far') most remote in space or time or order
“had traveled to the farthest frontier”
“don't go beyond the farthermost (or furthermost) tree”
Source: WordNet 3.1, Princeton University
