forming adjectives from verbs, with the meaning: fit for, able to, liable to, or worthy to act or be acted on in the specified way
breakable
reliable
credible
get-at-able
forming adjectives from nouns, with the meaning: marked by, providing, or possessing the quality or attribute specified
knowledgeable
comfortable
-ably suffix
[Middle English via Old French from Latin -abilis, -ibilis, from -bilis capable or worthy of]