farther

adjectives

more distant in especially space or time
"they live in the farther house"
is similar to
located at a great distance in time or space or degree
"we come from a far country"; "far corners of the earth"; "the far future"; "a far journey"; "the far side of the road"; "far from the truth"; "far in the future"
more distant in especially degree
"nothing could be further from the truth"; "further from our expectations"; "farther from the truth"; "farther from our expectations"

adverbs

to or at a greater extent or degree or a more advanced stage (`further' is used more often than `farther' in this abstract sense)
"further complicated by uncertainty about the future"; "let's not discuss it further"; "nothing could be further from the truth"; "they are further along in their research than we expected"; "the application of the law was extended farther"; "he is going no farther in his studies"
to or at a greater distance in time or space (`farther' is used more frequently than `further' in this physical sense)
"farther north"; "moved farther away"; "farther down the corridor"; "the practice may go back still farther to the Druids"; "went only three miles further"; "further in the future"