A further,
furthest
These, like farther/farthest, can be
used as adverbs of place/distance:
It isn't safe to go any
further/farther in this fog.
But they can also be used in an abstract sense:
Mr A said that these toy
pistols should not be on sale.
Mr B went further and said
that no toy pistols should be sold.
Mr C went furthest of all and
said that no guns of any kind should be sold.
