agitant
/ˈadʒɪt(ə)nt/noun
1A person who causes or is involved with agitation; = agitator.
2Something that causes agitation; = agitator. Usually figurative rare.
adjective
Relating to, causing, or engaged in agitation. rare.
Origin
Mid 17th century (in an earlier sense). From classical Latin agitant-, agitāns, present participle of agitāre agitate.