-ibly

Used to form adverbs corresponding to adjectives that end in -ible.

Suffix

  1. Used to form adverbs corresponding to adjectives that end in -ible.
    • audible → audibly

Origin

Euphonic blend of -ible + -ly, due to difficulty of pronouncing *-iblely. Compare same sound change in unrelated feebly, nimbly, and nobly.

Forms

-ably