concupiscence

thumb|St. Augustine explored and used the term "concupiscence" to refer to sinful lust.

Concupiscence (from Late Latin , from the Latin verb , from , "with", here an intensifier, + , "to desire" + , a verb-forming suffix denoting beginning of a process or state) is an ardent longing, typically one that is sensual. In Christianity, particularly in Catholic and Lutheran theology, concupiscence is the tendency of humans to sin.