American Idioms – Idiom Wizard Lists Over 5,500 Idioms & Slang Descriptions

Dead serious


Extremely serious. An important matter to be considered. ‘Dead’ is used as an adjective to emphasize that the matter is as serious as death itself! (Compare to Don’t play games or Gravity of the situation.)

“When my aunt was talking about ghosts she has seen, I started to giggle but she was dead serious.”

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