

“Doubt,” of course, basically means “uncertainty” and comes ultimately from the Latin “dubitare,” meaning “to waver in opinion.” “Doubt” is also related to the word “dubious,” which can mean both “full of doubt” (“Bob was dubious about his chances of surviving the camping trip”) and “of uncertain outcome questionable” (“The dubious land deal backfired and Jim landed in jail”). Just when “beyond a shadow of a doubt” first appeared is hard to pin down, but the equivalent “without doubt” (meaning “absolutely true”) appeared in the early 16th century, and “shadow of a doubt” was popular in the 19th century. “Beyond a shadow of a doubt” also has no place in a courtroom (except as hyperbolic rhetoric), where the standard in US criminal trials is usually that the defendant must be found guilty “beyond a reasonable doubt,” a lower hurdle than “beyond a shadow of a doubt.” As such, “beyond a shadow of a doubt” doesn’t work well with subjective statements of preference, taste, or emotional state, and announcing that “I am, beyond a shadow of a doubt, happier with my cheapo plastic vacuum than you will ever be with your dumb old Dyson” is unlikely to be accepted by listeners.

“Beyond a shadow of a doubt” and similar phrases mean “absolutely true, without any possibility of negation” applied to a statement of fact. You’re in no position to spend $600 on an awesome vacuum cleaner, so you might as well buy ours.” Thanks, guys, I feel poorer already.

But then they pointed out, rather bluntly, “Let’s face it. Suddenly, even though we own two elderly but functional Sears vacuum cleaners, I wanted a Dyson. It could have been an unusually informative Dyson commercial. It’s a cheap imitation Dyson, and they spent the first few minutes lavishly praising the real Dyson and its supposedly awesome virtues. I saw a weirdly fascinating one for a vacuum cleaner the other day. I’ve been hearing the “without” version on stupid late-night infomercials. Dear Word Detective: I’ve got two questions for you: 1) where did the phrase “beyond a shadow of a doubt” come from, and 2) which is more correct, “beyond a shadow of a doubt” or “without a shadow of a doubt”? I believe the latter is not right, maybe because doubt probably casts a long shadow no matter what, so you want to be beyond that shadow.
