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Webster 1913 Edition

Adj.

[L.

inerrabilis

. See

not, and

Incapable of erring; infallible; unerring.

“Inerabble and requisite conditions.”

Sir T. Browne.

“Not an inerrable text.”

Gladstone.

Adj.

[in and err.] That cannot err; exempt from error or mistake; infallible.

inerrable ‎(comparative more inerrable, superlative most inerrable)

Incapable of error; infallible.
- Sir Thomas Browne
  We have conviction from reason, or decisions from the inerrable and requisite conditions of sense.
(Can we find and add a quotation of Gladstone to this entry?)