A new one to me, I saw it in another top Obit the fuller meaning is below but they used it to refer to resistance groups infighting and splitting up . Shall we all try to use it at least once today?
Etymology: Latin fissus, past participle of findere + English -parous
Date: 1874 : tending to break up into parts : divisive
— fis·sip·a·rous·ness noun
(adj) : Factious, tending to break into pieces; causing division or fragmenting something
synonyms: factious, unstable, divisive, fragmenting