The Greek adjective barus describes something heavy, weighty, burdensome, or grievous. It is used to describe heavy burdens (Matthew 23:4), the weightier matters of the law (Matthew 23:23), fierce wolves (Acts 20:29), and the claim that God's commands are not barus (1 John 5:3). The word encompasses both physical and moral weight.
Jesus' condemnation of the Pharisees centers on barus: they loaded people with heavy burdens but did not lift a finger to help (Matthew 23:4), while neglecting the 'weightier' matters of justice, mercy, and faithfulness. In contrast, Jesus says 'my yoke is easy and my burden is light' (Matthew 11:30). John affirms that keeping God's commands is not burdensome for the one who loves God (1 John 5:3). Love transforms the weight of obedience.