Synonyms

truth serum

American

[trooth seer-uhm] / ˈtruθ ˌsɪər əm /

Often truth drug

noun

a drug, as the barbiturate thiopental, that induces in the subject a desire to talk or a state of heightened suggestibility, used in psychotherapy and in interrogation to discover repressed or consciously withheld information.

Etymology

Origin of truth serum

First recorded in 1920–25

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

truth serum

As the YouTube hit demonstrates, hot sauce isn’t just for daredevils and masochists: It’s a truth serum.

From The Wall Street Journal ● Nov. 20, 2025

“If opening day was today, he would certainly be running out there in center, which I know he loves. I think if you put truth serum in him, that’s what he’d want to do, regardless.”

From Seattle Times ● Dec. 7, 2023

Now it was being recast as a kind of truth serum, a tool of deep personal introspection.

From New York Times ● Nov. 15, 2021

“COVID,” he says, “is a truth serum bringing it all out.”

From Los Angeles Times ● Aug. 27, 2020

They’re trying to develop a powerful truth serum, one that even GPs as serum-resistant as I am are not immune to.

From "Allegiant" by Veronica Roth

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023