serious as a heart attack

adjective

Completely serious and not joking at all.

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Meanings

adjective
  1. USinformalsimileCompletely serious and not joking at all.
Cite this entry
APA

serious as a heart attack. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/serious%20as%20a%20heart%20attack

MLA

“serious as a heart attack.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/serious%20as%20a%20heart%20attack. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “serious as a heart attack,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/serious%20as%20a%20heart%20attack.

Source: serious as a heart attack on Wiktionary, CC BY-SA 4.0.