-ably

• -ibly
• -bly^[1]

From -able +‎ -ly.

• IPA^(key): /əbli/ (unstressed)

• Audio (Southern England):

  (file)

-ably

1. Used to form adverbs corresponding to adjectives that end in -able.

   suitably

Generally only used to form analogs to adjectives ending in -able, replacing the existing -able. Rather than a distinct suffix, this can be considered a class of euphonic blends of -ble and -ly, as in feebly, nimbly, and nobly, among others. Compare -ability, which is more strictly an analog, originating in parallel borrowings from French, sometimes Latin.

• Alby, Blay, blay