'Understanding' in the Bible

Desiring to be teachers of the law; understanding neither what they say, nor whereof they affirm.

understanding the fact that law is not enacted for the righteous person [the one in right standing with God], but for lawless and rebellious people, for the ungodly and sinful, for the irreverent and profane, for those who kill their fathers or mothers, for murderers,

he is conceited, understanding nothing, but has a sick interest in disputes and arguments over words. From these come envy, quarreling, slander, evil suspicions,