ultraism
noun
ul·tra·ism ˈəl-trə-ˌi-zəm 
1
: the principles of those who advocate extreme measures (such as radicalism)
2
: an instance or example of radicalism
ultraist
ˈəl-trə-ist
adjective or noun ultraistic
ˌəl-trə-ˈi-stik
adjective 
Word History
First Known Use
1821, in the meaning defined at sense 1
- in the doghouse
- in the driver's seat
- in the dumper
- in the end
- in the erroneous belief that
- in the event
- in the event of
- in the extreme
- in the face of
- in the final analysis
- in the final/last analysis
- in the firing line
- in the first degree
- in the first flush of
- in the first instance
- in the first place
- in the flesh
- in the flower of one's youth
- in the flush of
- in the forefront
- in the foreseeable future
- in the frame
- in the front rank
- in the fullness of time
- in the grease