Can't define intelligence, for there are many kinds of it.
First of all, IQ tests mean absolutely squat, and I generally get >140 scores (I bet a lot of people on this board get high scores).
A high IQ score doesn't mean you understand things that other people don't. You can just elaborate them faster and with a more effective logic "stream". 90 IQ person will still solve the quiz, but in 5x the time and with MUCH more effort.
Now on the real topic. You can have a 190 IQ person, totally handicapped in "daily things" logic.
Real-life example. I work with horses in the Army. A lot of kids (18-22 years old) come in and out of this place for their 1st year of service, so I can observe a lot of different personalities in an unusual working set-up (vast majority of them have never had anything to do with horses). Now on the two "extremes" of personality. You can see the very smart kid with super-high quiz scores, but he's totally fucking challenged in anything manual. After two months he still doesn't know how to saddle a horse, put things all in the wrong places and generally pull off stupid shit like standing 50 cm behind a horse surrounded by flies.
The kid is not stupid, but he's simply unable to put his intelligence in action.
Then there's the opposite. Kid dumb as a brick wall. You think you are talking with a caveman but he surprisingly learns how to do everything in two weeks. Then you can leave him in charge for the week-end and on monday everything's fine, while smart kid n.1 is still trying to figure how to enter a box without crushing himself between the horse and the doorjamb.
This kid will never figure how to solve some logic quiz, but has great "pratical" intelligence for manual work (wich is not necessarily dull or repetitive).
Obviously those two are the extremes and there are all the intermediate personalities. There are people with both brain and manual intelligence (like myself
). But wich one is smarter between these two? I know I can't pick one.
Then there's the culture factor. A person may know a lot of things, read a lot and generally have a good general culture, but can still be totally stupid. Maybe he simply
looks smart, but he's just got a very good memory and can quote things he's read 15 years ago.
Common sense. Smart people still do stupid shit. If you did not figure it yet, I consider myself a smart person. But I still drive at 190kmh on the highway, and that's definitely NOT a smart thing to do. I often drink myself to oblivion with my friends and, again, that's not a smart thing to do.
And, finally, there's what in my opinion discerns intelligence from genius. Creativity. The greatest minds in human history have always been smart people with the capacity to put their gift in action on something totally new and original.
Yeah, wall of text and probably multiple grammar/spelling mistakes. Not my first language, sorry about them.
To sum it up, you can't define intelligence. There are many different kinds of it.