n.
Variant: or il- or im- or ir-
Function: prefix
Etymology: Middle English, from Anglo-French, from Latin; akin to Old English un-
: not : NON- , UN- ― usually il- before l < il logical>, im- before b, m, or p < im balance> < im moral> < im practical>, ir- before r < ir reducible>, and in- before other sounds < in conclusive>