Category Archives: Troublesome pairs

I have found these words being mixed up in all sorts of contexts, from instructions to posters, and in all sorts of texts. I’ve also needed to look up which is which when following exercise or yoga instructions! Do you know the difference between prone and supine and do you use them appropriately? Or are they in fact different in the end at all?

Here’s another in my series of Troublesome Pairs to help you (and remember: if you have one for me, check the index then do send it over!).

Prone and supine both mean lying flat. But which way up, that’s the question.

Prone means lying flat, especially face downwards (Oxford Dictionaries). Collins online goes straight to the face-down aspect. Merriam-Webster have it as lying prostrate (adjective) or flat, and a second definition of lying front-downwards. According to all three of them, prostrate means lying flat with the face downwards (you prostrate yourself in front of an emperor, an altar, etc., so that makes sense, and Merriam-Webster, which is bigger than my one-volume Oxford, adds the air of worship to its definition, while Collins adds it to a definition of “prostrating yourself”).

Supine is unequivocably defined as lying flat, face upwards.

So prone can mean lying flat OR lying flat, face downards, prostrate adds an air of worship or respect and supine only means lying flat, face upwards.

You can find more troublesome pairs here and the index to them all so far is here.

Thank you to my husband Matthew for suggesting this one (he’s quite the fount of troublesome pairs, so watch out for more of his ones as we go through this new set of them), after he discovered himself that these two are in fact two different things.

So what’s the difference between a mandolin and a mandoline?

A mandolin is a musical instrument which is like a lute, with pairs of metal strings that are played using a plectrum.

A mandoline (which can also be spelled mandolin, hooray!) is that vegetable slicer thing (a flat body with adjustable slicing blades) that always looks like it will take your finger off.

“She was playing the mandolin, being careful not to hurt her fingers on the metal strings, while he cut vegetables using the mandoline, bring careful not to slice his fingers on the metal blades.”

You can find more troublesome pairs here and the index to them all so far is here.

What’s the difference between constantly and consistently? Find out below …

Constant means remaining the same but its primary meaning is happening continuously, and it also has a metaphorical meaning of dependable and faithful. So to do something constantly means to do it all the time, as well as remaining constant or the same (and also doing it dependably).

Consistent means done in the same way over a long period of time, including an attribute of fairness and accuracy. It also means being compatible with (as in x was consistent with y). So doing something consistently means doing it in the same way over a long period of time, which does echo the secondary sense of constantly, but constantly also includes a sense of doing it continuously, which consistently doesn’t.

For example, I am constantly taking photos that I put up on social media, every day if not more; I consistently post a books of the year round-up on the first of January every year.

You can find more troublesome pairs here and the index to them all so far is here.

What’s the difference between instant and instantaneous? Is there in fact a difference?

There are lots of pairs of words that mean the same thing, but one has a precise meaning and the other has a range of meanings. Now, if there are two words with subtly different meanings, I’m all for keeping both of them and retaining the richness of our wonderful language, etc. But when one just covers a subset of the other’s meanings, I’m not, to be honest, quite sure. At least here there seems to be a technical term lurking around which will keep the smaller (yet longer!) word going.

So, instantaneous, to cover the smaller meaning first, means being done or happening instantly. It does have a specific meaning in physics around being measured or existing at a particular time.

Instant means occurring immediately, as you would expect, as well as a precise moment in time or a very short time. It also means something that’s processed to allow it to be prepared quickly, in the case of food, mainly, Also, and I dimly remember this from when I learned to type in the Dark Ages, it means “of the current month” (your letter of the 16th instant) although surely no one uses that now?

Both of them come from the same original source, from Latin for “be at hand” (instare), but instantaneous came through medieval Latin, which added -aneus to the original instant (thank you, Oxford English Dictionary for that information). I would advise using instant unless you’re a physicist, just to save complication and make it easier to read.

You can find more troublesome pairs here and the index to them all so far is here.

This one was suggested by Neil Langley posting on my main Troublesome Pairs post.

So what is the difference between complex and complicated? Is there one?

The answer is that their meanings overlap. The main dictionaries in the US and UK (Oxford, Merriam-Webster, etc.) define complex using the word complicated, so the adjective complex means made up of many different parts, or complicated. Complicated means consisting of many interconnecting parts, or intricate. So very similar.

The noun complication moves on to describe something that makes something complicated, a complex state (there we go again) and in medical terminology, a disease or condition that is secondary to the main one but makes it worse.

Complex as a noun can mean a few more things – an interlinked system (the military-industrial complex), and then Oxford links but Merriam-Webster lists separately, a group of interlinked buildings. It also has a meaning in psychology of a group of emotionally significant but repressed ideas which cause an abnormal kind of behaviour or an abnormal state (a persecution complex), and by extension, a more pop-psych preoccupation or exaggerated reaction (I have a complex about spiders). There’s a chemical meaning to do with connections, too.

So the nouns vary, but if you’re describing something made up of lots of different things that might be a bit confusing or intricate, it can be complicated OR complex.

Having done some rooting about, I did discover this Washington Post resource claiming to delineate a difference.

You can find more troublesome pairs here and the index to them all so far is here.