Serious Synonyms
Words/phrases that have a similar definition to the word "serious" include...staid, life-threatening, decided, unsmiling, intense, powerful, solemn, severe, dangerous, genuine, fundamental, acute, sincere, determined, grim, humorless, considerable, honest, resolute, crucial, deep, momentous, significant, major, profound, critical, thought-provoking, stern, grave, somber, sober, important, vital, earnest, meaningful
Other words in thesaurus...