Definitions and concepts
When you are speaking to someone, it is not wrong to use any manner of terminology to express concepts and ideas, just so long as there is an agreed upon definition of what those terms represent. Frequently, however, people use terms without having any idea of what they are actually saying.
A fascinating experiment that proves this fact can be accomplished anytime with virtually anyone. Take a simple term that is used fairly widely, and when you hear someone express themselves by using that term, ask them to explain it.
Take, for instance, the term "stupid". I hear people all the time talking about someone who was so stupid, or actions that they deemed to be stupid. Yet, when asked to define what "stupid" means, they are completely dumbfounded.
The word, of course, has a definitive meaning. It is commonly misassociated with the word "dumb". However, the term "stupid" comes to us from the latin term stupidere, which means "one without words". It's evolved meaning in present-day speech associates it with dull-witted or senselessness. Dumb, on the other hand, has to do with the inability to speak.
To be capable of defining your terms means that you are able to actively express yourself, rather than relaying the impressions of others. Yet, more and more, it seems that people have a tendancy to merely repeat the phrases that others have stated under similar circumstances. It's like a bunch of little toddlers running around like mockingbirds imitating each other.
To my eye, it shows the way that so many have determined that they desire to have others do their thinking for them. Perhaps they are saying something to the effect of "don't interrupt my life by making me live it!"
If you cannot define your terms, you really ought not use them. If you are calling someone "stupid" because you have no other terms that you can consider, than you really are one without words. And that makes you "stupid" indeed.
I am become death, destroyer of worlds