'Solemn' in the Bible

So the Apostles, after giving a solemn charge and delivering the Lord's Message, travelled back to Jerusalem, making known the Good News also in many of the Samaritan villages.

So they arranged a day with him and came to him in considerable numbers at the house of the friends who were entertaining him. And then, with solemn earnestness, he explained to them the subject of the Kingdom of God, endeavouring from morning till evening to convince them about Jesus, both from the Law of Moses and from the Prophets.