The meaning of the word unscrupulous as used in the paragraph 14 means shameless.
The passage from which the question and the word was taken, accused McCarthy of not having any forms of decency left.
The people in the country had began to feel that he was unscrupulous in the way that he attacked the military.
With these two paragraphs we can easily see that he is being accused of being shameless in the way that he was attacking the military.
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