Verses with the word solemn in the Apocrypha (7 verses):

2 Esdras 1:31
When ye offer unto me, I will turn my face from you: for your solemn feastdays, your new moons, and your circumcisions, have I forsaken.

Judith 8:6
And she fasted all the days of her widowhood, save the eves of the sabbaths, and the sabbaths, and the eves of the new moons, and the new moons and the feasts and solemn days of the house of Israel.

Sirach 47:10
He beautified their feasts, and set in order the solemn times until the end, that they might praise his holy name, and that the temple might sound from morning.

Baruch 1:14
And ye shall read this book which we have sent unto you, to make confession in the house of the Lord, upon the feasts and solemn days.

Additions to Esther 16:22
Ye shall therefore among your solemn feasts keep it an high day with all feasting:

1 Maccabees 10:34
Furthermore I will that all the feasts, and sabbaths, and new moons, and solemn days, and the three days before the feast, and the three days after the feast shall be all of immunity and freedom for all the Jews in my realm.

2 Maccabees 5:10
And he that had cast out many unburied had none to mourn for him, nor any solemn funerals at all, nor sepulchre with his fathers.