Infect
Part of speech: verb
Definition: to bring into contact with a substance that can cause illness (a pathogen) to make somebody enthusiastic about one's own passion
Taint
Part of speech: verb
Definition: To contaminate or corrupt (something) with an external agent, either physically or morally.To spoil (food) by contamination.
Part of speech: noun
Definition: A thrust with a lance, which fails of its intended effect.An injury done to a lance in an encounter, without its being broken; also, a breaking of a lance in an encounter in a dishonorable or unscientific manner.A contamination, decay or putrefaction, especially in foodA mark of disgrace, especially on one's characterThe perineum.