The quality or state of being assured; confidence, certainty, or freedom from doubt.
From assured (past participle of assure) plus -ness suffix. Assured comes from Latin assecurare meaning 'to make secure,' evolving through Old French into Middle English.
Assuredness is that calm, unshakeable confidence—like when a student studies so hard for a test that they walk in with complete assuredness, versus nervous cramming. Psychologists find that real assuredness comes from preparation, not just from pretending to be confident.
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