farthest

to the greatest distance in space or time (`farthest'' is used more often than `furthest'' in this physical sense)

• “see who could jump the farthest”
• “chose the farthest seat from the door”
• “he swam the furthest”

to the greatest degree or extent or most advanced stage (`furthest'' is used more often than `farthest'' in this abstract sense)

• “went the furthest of all the children in her education”
• “furthest removed from reality”
• “she goes farthest in helping us”

most distant or remote

• “man”

(comparatives of `far'') most remote in space or time or order

• “had traveled to the farthest frontier”
• “don”
• “;”
• “;”