i Register
In some senses, solemn is marked as obsolete. Watch for register when choosing this word.
VERBS
be, look, seem, sound
The judge's expression seemed solemn as she announced the verdict to the courtroom.
become, grow
The atmosphere in the room became solemn when the principal announced the news.
remain
ADV
very
The judge looked very solemn as she announced the guilty verdict to the courtroom.
rather
The judge spoke rather solemn words to the defendant before announcing the sentence.