LATIN PREFIX 9 IN-, IL-, IM-, IR-(=not, un-) illegible not legible; not able to be read illiterate not literate; unable to read and write; uneducated illogical not logical; not observing the rules of logic (correct reasoning) immaculate not spotted; absolutely clean; stainless immature not mature; not fully grown or developed impunity state of being not punished; freedom from punishment, harm, ..