'Solemn' in the Bible

“Do not bring worthless offerings again,[Your] incense is repulsive to Me;[Your] New Moon and Sabbath [observances], the calling of assemblies—I cannot endure wickedness [your sin, your injustice, your wrongdoing] and [the squalor of] the festive assembly.

And in that day you will say,“Give thanks to the Lord, call on His name [in prayer].Make His deeds known among the peoples [of the earth];Proclaim [to them] that His name is exalted!”

“What shall I say?For He has spoken to me, and He Himself has done it;I will wander aimlessly all my years because of the bitterness of my soul.

“So I will profane the officials of the sanctuary,And I will consign Jacob to destruction and [I will subject] Israel to defamation and abuse.