indefectibly

/ˌɪndɪˈfɛktəbli/
adverb
  1. In a way that is perfect, without flaws, and cannot fail or end.
    • She indefectibly kept her promise, visiting her grandmother every Sunday without fail.
    • The clockwork mechanism ran indefectibly for over a century without a single repair.
    • The team worked indefectibly together, never missing a deadline or making an error.
Antonyms
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