ablutions (en)

(noun) the washing of one's body or part of it (as in a religious rite) / (noun) the act or action of bathing / (noun) a building housing bathing and toilet facilities on a military base

fescennine (en)

(adjective) scurrilous obscene

invidious (en)

(adjective) tending to cause discontent, animosity, or envy / (adjective) envious / (adjective) of an unpleasant or objectionable nature; obnoxious / (adjective) of a kind to cause harm or resentment

Manichaeism (en)

an ancient religious movement that has to do with duality? "an elaborate dualistic cosmology describing the struggle between a good, spiritual world of light, and an evil, material world of darkness"