We found 3 dictionaries that define the word be serious:

General (2 matching dictionaries)

Slang (1 matching dictionary)

1. Be Serious: Urban Dictionary

Phrases: to be serious, trying to be serious, more... ▸ Words similar to be serious ▸ Usage examples for be serious ▸ Idioms related to be serious ▸ Wikipedia articles (New!) ▸ Words that often appear near be serious ▸ Rhymes of be serious ▸ Invented words related to be serious