Smart no it all with big brain that probably goes to a grammar school
(Smart) is someone that noes a lot of things
Not you seartching this up
I am not very smart.... And neither are you
Something well suited to its purposes
Someone good at creating/doing things well suited to their purposes.
(Purpose: the reason for which something is done or created or for which something exists.)
This definition of smart is smart because it makes good contextual sense.