It's likely you meant solemn, which has a few different meanings:
* Serious and dignified: This is the most common meaning of solemn. It describes something or someone that is formal and serious, lacking in humor or lightheartedness. For example, a solemn oath, a solemn occasion, or a solemn face.
* Marked by deep feeling or seriousness: This meaning emphasizes the emotional weight of something. For example, a solemn promise, a solemn vow, or a solemn farewell.
* Characterized by religious reverence or awe: This meaning applies specifically to religious contexts. For example, a solemn mass, a solemn ceremony, or a solemn procession.
If you were thinking of another word, please let me know!