noun

exceptional intellectual or creative power or other natural ability.

she was a teacher of genius

brilliance,great intelligence,great intellect,great ability,cleverness,brains,erudition,wisdom,sagacity,fine mind,wit,artistry,flair,creative power,precocity,precociousness,talent,gift,aptitude,facility,knack,technique,touch,bent,ability,expertise,capacity,power,faculty,endowment,strength,strong point,forte,dexterity,adroitness,skill,virtuosity

adjective

very clever or ingenious.

a genius idea