Similar to impenetrabiilis
- penetrabilis – capable of being penetrated, penetrating, piercing
- penetralis – inner, internal, passing through, penetrating
- impetus – assault, attack, force, impulse, onset, passion, rapid motion, rush, sudden passion, vehemence
- imperator – commander in chief, emperor, general
- impeditus – embarassed, entagles, hindered, obstructed, prevented
- impedio – ensnare, entangle, hinder, hold fast, obstruct, prevent, surround, to entangle
- impedimentum – difficulty, hindrance, impediment, obstacle