Similar to imperceptus
- imperterritus – undaunted
- impertior – to bestow
- impervius – unpassable
- impetus – assault, attack, force, impulse, onset, passion, rapid motion, rush, sudden passion, vehemence
- immotus – unmoved
- impeditus – embarassed, entagles, hindered, obstructed, prevented
- impunitus – safe, unpunished, unrestrained