What is the meaning of Il-?

not; a form of the prefix in-, used before l

Form used before a root beginning with the letter l of in-

the subject of an active transitive verb

the subject of an intransitive active verb

Variant of in- used before l

multiple, poly-, multi-

miscellaneous

sundry

composite

alternative form of oll- (“great, gross”)

alternative form of in-

alternative form of in-

the

Source: wiktionary.org