4.78 'in-', 'il-', 'ir-'

Another common prefix is 'in-'. It is added to some adjectives, adverbs, and nouns instead of 'un-'.

'Il-' is added to some adjectives, adverbs, and nouns beginning with 'l'. 'Im-' is added to others which begin with 'b', 'm', or 'p', and '-ir' is added to some which begin with 'r'.