It should be noted that the appropriate word that can be used to replace the phrase in italics will be boldness.
From the information given, we are simply to choose the word that can be used to replace the word in italics.
In this case, the chosen word is gall. It should be noted that gall means boldness. Therefore, the sentence will be "The boldness he displayed during his exchange with the police officer made us all uneasy"
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