in-

Forms

• in-
• im- — Used before b, m, or p in Latin.
• il- — Used before l in Latin.
• ir- — Used before r in Latin.

Origin

Reconstructed Proto-Indo-European *n̥-, the unstressed negative form associated with *ne, ‘not.’

Note

Unrelated to the Latin in- meaning ‘in’ or ‘into,’ despite their matching forms.