Very challenging or unsolvable
I presume you mean driving a car, and you put your foot down to 'go harder'. :)
No
It means its harder
Harder, tighter, less floppy.
I don't know what you mean by harder snakes. Most snakes eat mice.
it means T (research harder)
it means push harder
If you mean harder as in muscles, protein and complex carbohydrates usually help build muscle but exercise is the most important. If you mean harder as in an erect penis, there is no food that will help that. General good health is the only thing that can aid in an erection.
to go harder
mmm I guess you mean Portuguese not Brazilian. And yeah, portuguese is a little bit harder to pronounce than spanish.
the hardness of the wheel. The higher the number, the harder the wheel will be :)
uh, i think you mean 'metamorphic'....