Imperturbable Charm
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The Imperturbable Charm is a charm that blocks anything (such as sound waves and thrown objects) from an object, such as a door. To check if such a spell has been cast, one can throw something at the possibly Imperturbed object; if the object does not touch it, an Imperturbable Charm is in effect.
Ginny tried throwing dungbombs at the kitchen door in number twelve, Grimmauld Place to see if the Extendable Ears could work; the dungbombs bounced off, and she coolly blamed Crookshanks for the mess when questioned by Molly (OP4).
