What is the meaning of -ilis?

-ing/-ible; used to forms adjectives from verbs meaning "acting, prone to acting, having the power to act or be acted upon".

used to form relative adjectives from verbs indicating the process by which something is produced

used to form an adjective from a noun or adjective stem, sometimes with passive meaning

-ile; used to form adjectives, usually from nouns, indicating a relationship or a pertaining to.

Source: wiktionary.org