On the jarvis site, I have noticed that we tend to lump Jewish, Christian and Muslim fundamentalists, extremists, fanatics, etc. together.  Among Jews, however there so many different kinds of fundamentalist that I thought I would share a bit of a map with you.
A Jewish fundamentalist believes the Tanakh and Talmud are the word of god and that this word commands them to live in the Holy Land under no one’s sovereignty except god’s.  Such a person is generally indifferent to what anyone else who is not Jewish, believes and does not care how they live,
provided that these do not interfere with god’s commands to his people.  A Jewish fundamentalist does not seek to rule over others who are not Jewish but might very well treat non-Jews with indifference or hostility.  This indifference and hostility is even more marked in how they would behave
towards other Jews who are not like them.  In their view, all Jews are commanded to be God’s holy people and the only way to do this is by obeying every scintilla of the Holy Writings as interpreted by their particular rabbis.  They believe that at the end of the world, God will send his messiah to set the world straight, all will realize the error of their ways and all will worship the one true god and see Israel as his chosen people.
These fundamentalists are split in several ways.   Some see God acting through history and believe that humans have to partner with god in bringing about its ultimate salvation.   They see the state of Israel as “the dawning of our redemption”, in other words, just an opening step in what is to come. The state is not salvation itself, but its precursor. They support the state of Israel but often keep their distance from it.  Some will not serve in its armed forces, for instance.  Others are ultra-nationalists.  They are
ready to ensure the whole of the holy land described in scripture is occupied by Jews because that is what they understand they are commanded to do.  They are like the Zealots of ancient times in their willingness to bear arms and die for this cause and their religious motivation to do so.  Some are in between.
Other fundamentalists believe that Jews should take no steps towards the occupation of the holy land politically, until the real messiah appears and god declares his final intentions.   Such people also believe that it is a commandment for Jews to live in the holy land (under the sovereignty of anybody but Jews) until that time.  They do not support the state and some actively oppose it.  You see representatives of this latter groupuscule at international conferences that are meant to condemn Israel and they are given a lot of press, even though they represent an infinitesimally small proportion of the Israeli population (a tiny fraction of a percent).
Most of these fundamentalists live in hierarchical, paternalistic communities and this is probably one thing they have in common with their counterparts in Christianity, Islam and other religions.
The fundamentalist zealots, those ready to bear arms, are probably the ones who are the most “westernized” and many of them are ex-Americans, ex-Brits, ex-Canadians, and ex-South Africans.
The “settler” movement is made up of both relgious and secular nationalists. They cooperate to achieve a similar goal but their motivations are very different.    The secular nationalists are like secular nationalists in the west.   They just want their country to occupy as much space as possible and are very distrustful of Arabs, or often, of anyone who does not share their view.  The nationalist movement in Israel is the nexus for the connection to fundamentalist Christian movements who see the reconstitution of holy Israel
in the holy land (and that means all Jews should move there) as a necessary condition for the Second Coming of Jesus.
But, and this is a big but, fundamentalist nationalist Jews cannot appeal to Jewish law or tradition to seek to expand beyond the holy land which even at its greatest extent was comparable to modern day Syria.
Fundamentalist Jews have no interest in ruling over non-Jews who live outside the holy land.  In their scriptures, anyone who is righteous, whether Jewish or not, has a place in the world to come or is not worth bothering about.  There is no need to convert anybody who is not Jewish nor to expand territory beyond the original borders of the holy land.
So when you use the word fundamentalist with respect to Jews, you should understand that you could be speaking of people who give lukewarm support to the state of Israel, viciously oppose it or seek to expand it to its maximum
limit through armed struggle - or any position in between those.
They could be people who see it as important to work with and assist all human beings or people who want to isolate themselves from contact with non-Jews.
They could be people who are relatively egalitarian with respect to women’s roles outside the home or synagogue or people who would strictly limit the role of women everywhere.
I am not sure, but perhaps it is possible to see this kind of variation among Christian and Muslim “fundamentalists” as well.