What's the noun for factiously? Here's the word you're looking for.
faction
A group of people, especially within a political organization, which expresses a sharedbelief or opinion different from people who are not part of the group.
“At times, monks might have warmer relationships with members of a seemingly opposing school than with the members of an opposing faction of their own school.”
“What leads us into faction is passion, which is the ability of feeling to overwhelm thought, and interest, which is the ability of need and desire to overwhelm thought.”
“Take the business of this newspaper, the rag that backed the rebel faction, and that was closed down for 60 days last month.”
“At times, monks might have warmer relationships with members of a seemingly opposing school than with the members of an opposing faction of their own school.”
“What leads us into faction is passion, which is the ability of feeling to overwhelm thought, and interest, which is the ability of need and desire to overwhelm thought.”
“Take the business of this newspaper, the rag that backed the rebel faction, and that was closed down for 60 days last month.”
factionalization
The formation of factions, often through conflict.