how to say “genius” in Hebrew
גָּאוֹן, גְּאוֹנִי
If you like Israeli music, you’ve likely come across at least a couple of songs by Yehoram Gaon, such as this one.
The name Gaon – גָּאוֹן 
listen and repeat – means excellence or majesty in Biblical Hebrew, but in Modern Hebrew it means genius.
listen and repeat – means excellence or majesty in Biblical Hebrew, but in Modern Hebrew it means genius. For example:
הַיַּלְדָּה הַזֹּאת פָּשׁוּט גָּאוֹן.
This girl is simply a genius.
Note that גאון refers to both males and females.
Now, that’s genius in the noun sense. To say that something is genius – to use genius in the adjective sense, you would use גְּאוֹנִי listen and repeat when describing something masculine and גְּאוֹנִית listen and repeat when describing something feminine.
listen and repeat when describing something masculine and גְּאוֹנִית listen and repeat when describing something feminine. For example:
אֵיזֶה רַעְיוֹן גְּאוֹנִי!
What a genius idea!