extenuate

You have probably encountered the phrase "extenuating circumstances," which is one of the more common ways that this word turns up in modern times. Extenuate was borrowed into English in the late Middle Ages from Latin extenuatus, the past participle of the verb extenuare, which was itself formed by combining ex- and the verb tenuare, meaning "to make thin." In addition to the surviving senses, extenuate once meant "to make light of" and "to make thin or emaciated"; although those senses are now obsolete, the connection to tenuare can be traced somewhat more clearly through them. Extenuate is today mostly at home in technical and legal contexts, but it occasionally appears in general writing with what may be a developing meaning: "to prolong, worsen, or exaggerate." This meaning, which is likely due to a conflation with extend or accentuate (or both), is not yet fully established.