To the greatest distance in space or time (`farthest' is used more often than `furthest' in this physical sense)
English: farthest, furthest
furthestEnglish
farthest, furthest, farthermost, furthermost, utmost
Adverb
To the greatest degree or extent or most advanced stage (`furthest' is used more often than `farthest' in this abstract sense)
English: furthest, farthest
Adjective
(comparatives of `far') most remote in space or time or order
English: farthermost, farthest, furthermost, furthest, utmost, uttermost