- 1. a. Infallible. Source: opted
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unfailable
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From the definitions
Word family
unfailingunfailinglyunfairunfairestunfairlyunfairnessunfairnessesunfaithunfaithfulunfaithfullyunfaithfulness
Nearby in the alphabet
unexpressedunexpressibleunexpressiveunexpurgatedunextendedunextinguishableunextricableunfaceunfacetedunfading
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