EtymEx

confidence

/ˈkɑːnfɪdəns/noun

Firm belief in oneself, another, or a proposition

From Latin con- (with) + Latin fīdō (to trust or believe).

Lineage

con-

fīdō

-entia

LatinRomanceGermanicnot directly attestedSelect a stage for details, or drag it

The story

Picture a medieval speaker saying that someone was worthy of trust: confidence began as an assurance placed in another person, not merely a feeling in your own chest. Its Latin ancestor cōnfīdentia grew from con- and fīdō, so the original image was almost “trust made especially firm.” The same trust-root, traced by etymological sources to PIE *bheidh-, appears in faith and fidelity—and even in fiancé, historically someone to whom one has pledged faith. Around 1400, English inherited confidence through Middle English, probably by way of Old French, although a direct Latin route is also possible. By the 1590s it could mean a secret, because telling someone confidential information was itself an act of trust; confidence is therefore both the feeling that opens your mouth and the secret that comes out of it.

Modern usage

Fearless self-assurance, especially in moving through social situations without worrying about others’ opinions

Heard in
social media · dating · youth slang
See
Urban Dictionary entry describing confidence as walking through a crowded hallway without caring what people think

Related words

Words from the same roots

con- · Latin, ‘with, together; sometimes intensively’

Derivedconjoin, connect, converge, conspire

fīdō · Latin, ‘to trust or believe’

Derivedfidelity, faith, diffidence, confide, confidant, defiance

-entia · Latin, ‘state or quality; abstract-noun suffix’

Derivedpatience, prudence, experience, dependence

Sources