形容詞 furthest:

1. (comparatives of `far') most remote in space or time or order
   同義詞：farthermost, farthest, furthermost, utmost, uttermost

副詞 furthest:

1. to the greatest degree or extent or most advanced stage (`furthest' is used more often than `farthest' in this abstract sense)
   同義詞：farthest
2. to the greatest distance in space or time (`farthest' is used more often than `furthest' in this physical sense)
   同義詞：farthest

1. That's the furthest thing from my mind. They explored the furthest reaches of space.
   我只能想這么多了。他們在太空探險到最遙遠的地方
2. Our house is the furthest away.
   我們的房屋是離這里最遠的一座。

fur.thest

adj.（形容詞）
far的最高級
Most distant in degree, time, or space:
最深最遠的：程度上最深的，時間或空間上最遙遠的：
例句：
That`s the furthest thing from my mind. They explored the furthest reaches of space.
我只能想這么多了。他們在太空探險到最遙遠的地方

adv.（副詞）
far的最高級
To the greatest extent or degree:
在最大范圍或程度上：
例句：
went the furthest of all the children in her education.
在所有孩子當中她是受教育最多的

At or to the most distant point in space or time:
最遠地：距離或時間上最遠的：
例句：
He swam the furthest.
他游得最遠

來源：
Middle English
中古英語
from further [more distant] * see further
源自 further [更遠的] *參見 further