brain — Your brain is the organ inside your head that controls your body's activities and enables you to think and to feel things such as heat and pain.
genius — an exceptional natural capacity of intellect, especially as shown in creative and original work in science, art, music, etc.: the genius of Mozart. Synonyms: intelligence, ingenuity, wit; brains.
adjective dingdong
sensible — having, using, or showing good sense or sound judgment: a sensible young woman.
steady — firmly placed or fixed; stable in position or equilibrium: a steady ladder.
responsible — answerable or accountable, as for something within one's power, control, or management (often followed by to or for): He is responsible to the president for his decisions.
