levity
lack of seriousness often at an improper time
Soliloquy
monologue, speaking one’s thoughts aloud
Grandiloquent
extravagent, pompous
Neologism
new word/expression; slang
Loquacious
talkative
Illustrious
grand, distinguished
Elucidate
to make something clear
Colloquial
informal, conversational word