"Clever" is the word that perhaps describes ENTPs best. The professor who juggles half a dozen ideas for research papers and grant proposals in his mind while giving a highly entertaining lecture on an abstruse subject is a classic example of the type. So is the stand-up comedian whose lampoons are not only funny, but incisively accurate.
ENTPs are usually verbally as well as cerebrally quick, and generally love to argue--both for its own sake, and to show off their often-impressive skills. They tend to have a perverse sense of humor as well, and enjoy playing devil's advocate. They sometimes confuse, even inadvertently hurt, those who don't understand or accept the concept of argument as a sport.
ENTPs are as innovative and ingenious at problem-solving as they are at verbal gymnastics; on occasion, however, they manage to outsmart themselves. This can take the form of getting found out at "sharp practice"--ENTPs have been known to cut corners without regard to the rules if it's expedient -- or simply in the collapse of an over-ambitious juggling act. Both at work and at home, ENTPs are very fond of "toys"--physical or intellectual, the more sophisticated the better. They tend to tire of these quickly, however, and move on to new ones.
ENTPs are basically optimists, but in spite of this (perhaps because of it?), they tend to become extremely petulant about small setbacks and inconveniences. (Major setbacks they tend to regard as challenges, and tackle with determin- ation.) ENTPs have little patience with those they consider wrongheaded or unintelligent, and show little restraint in demonstrating this. However, they do tend to be extremely genial, if not charming, when not being harassed by life in general.
In terms of their relationships with others, ENTPs are capable of bonding very closely and, initially, suddenly, with their loved ones. Some appear to be deceptively offhand with their nearest and dearest; others are so demonstrative that they succeed in shocking co-workers who've only seen their professional side. ENTPs are also good at acquiring friends who are as clever and entertaining as they are. Aside from those two areas, ENTPs tend to be oblivious of the rest of humanity, except as an audience -- good, bad, or potential.