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English word defiant comes from Latin dis-, Latin fidus, French fier ((reflexive) to trust (à), to rely on (à).), Middle French deffier (To defy.)
dis- (Latin)
Asunder, apart, in two. Reversal, removal. Utterly, exceedingly.
fidus (Latin)
Certain, safe. Loyal, faithful. Steadfast. Trusty, trustworthy, credible.
fier (French)
(reflexive) to trust (à), to rely on (à).
deffier (Middle French)
To defy.
*disfidare (Vulgar Latin)
desfier (Old French)
To defy.
défier (French)
(transitive) to defy, challenge.
défiant (French)
Mistrustful.
defiant (English)
Boldly resisting opposition.. Defying.