Thanks once again to Robyn Bradshaw in UR Catering for this pick. At first blush, I suspected a back-formation and a modern word, but The OED dates the word from the 18th Century for earliest recorded use by poet and wit Alexander Pope.
The root is indeed “cause” but it’s a certain kind. As our dictionary also notes, a casuist is “A theologian (or other person) who studies and resolves cases of conscience or doubtful questions regarding duty and conduct.”
Our word is not usually a positive one, as it is often associated with sophistry, or mere quibbling over causes in a way that obscures the truth. I suppose casuistry to be useful in our divided and money-haunted political system. Liars and thieves can then proceed with an untroubled conscience. For some reason, the image of Lucy from Peanuts came to my mind. She’s an expert at the dark arts of casuistry and Charlie Brown? Her perfect patsy.
As for a rule of style here? First, casuistry is not a back-formation, in the way that “solicitate” oozes from “solicit.” Bryan Garner makes it plain, in A Dictionary of Modern American Usage, that back-formations merely add weight but no meaning to a sentence. Garner advises avoiding them as “needless variations.” On the other hand, he likes (as do I) some back-formations such as “emote,” from the noun “emotion.” Thus language gains nuance and variety. Second, watch your spelling. Note the position of the “s” in our word. I had it misspelled to match “cause” until I proofread this post!
As we Charlie Browns of the world soldier on into the dog days of summer, please nominate a word or metaphor useful in academic writing by e-mailing me (jessid -at- richmond -dot- edu) or leaving a comment below.
Image courtesy of Caren Pilgrim at Flickr.