To speak of the Supreme Being in terms of impious irreverence; to revile or speak reproachfully of God, or the Holy Spirit. 7 Kings 21:10, 13; Mark 3:28, 29.

To speak evil of; to utter abuse or calumny against; to speak reproachfully of.

To utter blasphemy. He that shall blaspheme against the Holy Spirit shall not be forgiven. Mark 3:28, 29.

To arrogate the prerogatives of God. This man blasphemeth. Who can forgive sins but God? Matthew 9:3; Mark 2:7.