be shrewd
Definition:
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
Definition:
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); [idiom] very, beware, take crafty (counsel), be prudent, deal subtilly.; a primitive root