infallibly

From infallible +‎ -ly.

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infallibly (comparative more infallibly, superlative most infallibly)

1. In an infallible manner.

   The pope speaks infallibly ex cathedra.

   • 1837, Thomas Carlyle, chapter V, in The French Revolution: A History […], volume II (The Constitution), London: Chapman and Hall, →OCLC, book I (The Feast of Pikes), page 30:

     [I]n such way [the formation of political clubs], most infallibly of all, does Social Unrest exhibit itself; find solacement, and also nutriment.