Etymology

mistrustless

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Today it means: Without mistrust or suspicion; trusting, unsuspecting. Full definition →

First used 16th–20th c.
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The story

From mistrust + -less.

First known use, by meaning

  • 16th–20th c. Without mistrust or suspicion; trusting, unsuspecting.

Etymology from Wiktionary, CC BY-SA 4.0.