Well now, JH, you've brought up an interesting point. "Inconsiderate" is, I think, further from "thoughtless", than "considerate" is from "thoughtful". (Don't even mention that asymptote thing!) Thoughtless, to me, implies exactly that: lack of thought. Whereas, inconsiderate would or could mean that you may have been aware that what you were about to do wasn't very nice, but you went ahead and did it anyway. I'd be thoughtless if I took a parking space without looking to see if perhaps someone was waiting for it out of my immediate line of vision. I'd be inconsiderate if I saw someone coming from a distance and sped up to beat them to it. (And then there was the time when I was at a red light downtown, and to my delight saw an empty parking meter across the intersection. Then I saw someone pull up in front of it and hit their brakes. As my light turned green, their backup lights went on. I tore across the road and dove my car headfirst into the spot! What can I say, I was late for court! [shamefaced shrug])