"When opened, the standard error stream is not fully buffered; the standard input and standard output streams are fully buffered if and only if the stream can be determined not to refer to an interactive device."
Yes, it is absolutely possible to be intelligent and inarticulate simultaneously--as any video of Richard Feynman on YouTube can attest.
Articulate people tend to be well-read. In fact, being well-read is often sufficient to give one the appearance of being articulate, as it enables you to recognize literary allusions and references made by others and empowers you to make your own. Being well-read also gives you a better appreciation for language as a tool and ideas on how best to wield it. You need to start reading much more, particularly the Great Books of centuries past. Yes, it will be difficult and slow-going at first, but as your vocabulary and literary knowledge grows, it will get easier and more enjoyable.
Standard Error is unbuffered: http://www.opengroup.org/onlinepubs/009695399/functions/stdi...
"When opened, the standard error stream is not fully buffered; the standard input and standard output streams are fully buffered if and only if the stream can be determined not to refer to an interactive device."