Nope... You're not Lazy, nor have you by proxy of Major Depression lost your intellect. I do know that this illness of Major Depression will no doubt make you feel that way for sure.

Lets also take into account that just about every sub-type of clinical Depression includes a massive loss of Motivation, even for things you feel that you should get enjoyment from. There is no feeling of contentment or flow when the Beast of Depression is suffocating your brain.

When it gets really bad it feels as though it will never end. In fact it will even convince you that it will never end. (I should note that without being aggressive to get help then I suppose it could last forever and good chance even with recovery that in time it will return, but then you keep trying other things and eventually break out again.)

As for if you've become stupid? No way! Major Depressive disorder cannot harm your intelligence level at the core. Just read around in this forum and do you see any stupid people here? Not me. Much to the contrary. There are actually studies which indicate those with Major Depression as a chronic condition are "by in large" of a higher IQ than non-depressed individuals.

My Theory is that in some ways it is this higher level of intelligence that actually plays at least some part in the condition itself. Deep thinkers are always more prone to this illness than those for whom lack the mental capability to think at higher levels. If you really examine it my theory on the above would make perfect sense.

Then again... Perhaps we're not all that smart, but rather all of us are just surrounded by a lot of really stupid people and this gives us the false illusion that we are smart LOL!