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Indefectible

adjective | /indefectible/

Advanced WordsVERY HARD

Incapable of failing, deteriorating, or ceasing to exist; unfailing.

Learning Progress

Synonyms

unfailinginfallibleimperishable

Antonyms

fallibledefective

Examples

"She trusted his indefectible loyalty during the crisis. Means: She trusted that his loyalty would never fail during the crisis."

"The poem praises an indefectible source of hope. Means: The poem praises a source of hope that cannot be extinguished or lost."

Mnemonic Trick

The prefix “in-” means “not,” and “defectible” suggests being able to fail; indefectible means unfailing.

Source: Advanced WordsAdded: 9/28/2026

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