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Impediment Curse
Impedimenta
ihm-ped-ih-MEN-tuh
Stops/Slows down the subject.

Imperius Curse
Imperio
ihm-PE'R-ee-o
Causes the subject to be completely under the control of the caster.
NOTE: The use of this curse is not recommended, as it is not only Unforgivable; it is very mean. You will most likely go to Azkaban for using this curse.

Imperturbable Charm
Creates a magical barrier on an object to make it impossible to eavesdrop through.

Impervius
Makes the subject waterproof and/or water repellent.

Inanimatus Conjurus
ihn-aen-ih-MOH-tus kohn-JUR-us
Conjures a specified inanimate object.

Incarcerous
ihn-KOHR-sur-us
Brings thick ropes out of the air to wrap themselves around the subject.

Incendio
ihn-SEN-dee-o
Conjures fire.