Where does “infallibly” come from?
Infallibly comes from Latin infallibilis, formed from the prefix in- and fallibilis, ultimately deriving from Proto-Indo-European roots meaning "not" and "to deceive."
infallibly (English): In an infallible manner
Ancestry of “infallibly”, step by step
| Step | Language | Word | Meaning |
|---|
| 1 | English | infallible | Without fault or weakness; incapable of error or... |
| 2 | Medieval Latin | īnfallibilis | — |
| 3 | Latin | īn- | — |
| 4 | Latin | în | — |
| 5 | Latin | en | lookǃ beholdǃ; reallyǃ?; come onǃ |
| 6 | Proto-Italic | en | in |
| 7 | Proto-Indo-European | h₁én | in |