Answer :
Final answer:
The word in italics is 'protruded' and it means sticking out or projecting. It describes the person's confidence which is very evident and prominent.
Explanation:
The word in italics is protruded, which means sticking out or projecting. In this context, it is describing the confidence of the person mentioned in the sentence. The comparison of confidence to a muscle beyond his thin physique implies that the person's confidence is very evident and prominent despite their physical appearance.
Learn more about meaning and usage of the word 'protruded' here:
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