עָרַם ʻâram (H6191)

properly, to be (or make) bare; but used only in the derivative sense (through the idea perhaps of smoothness) to be cunning (usually in a bad sense)

1) to be subtle, be shrewd, be crafty, beware, take crafty counsel, be prudent 1a) (Qal) to be crafty, be subtle 1b) (Hiphil) to be crafty, be or become shrewd

a primitive root;