- to challenge the power of; resist boldly or openly: to defy parental authority.
- to offer effective resistance to: a fort that defies attack.
- to challenge (a person) to do something deemed impossible: They defied him to dive off the bridge.
- Archaic. to challenge to a combat or contest.
- a challenge; a defiance.
Origin of defy
- to resist (a powerful person, authority, etc) openly and boldly
- to elude, esp in a baffling wayhis actions defy explanation
- formal to challenge or provoke (someone to do something judged to be impossible); dareI defy you to climb that cliff
- archaic to invite to do battle or combat
Word Origin and History for undefiable
c.1300, "to renounce one's allegiance;" mid-14c., "to challenge, defy," from Old French defier, desfier "to challenge, defy, provoke; renounce (a belief), repudiate (a vow, etc.)," from Vulgar Latin *disfidare "renounce one's faith," from Latin dis- "away" (see dis-) + fidus "faithful" (see faith).