**Dishonor is the best meaning of the word “infamy”. **
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When President Roosevelt said on December 7, 1941 that the date would live in infamy he meant that the day would be remembered as a dishonorable and disgraceful day in American history do to the large loss of life from the Pearl Harbor attacks. Therefore, out of these words Roosevelt was equating the attacks to being done in manner that could be equated with "dishonor."
In his speech on December 8, 1941, President Roosevelt described December 7, 1941, as 'a date which will live in infamy' to denote its dishonorable and disgraceful nature due to the Pearl Harbor attack. The best meaning of 'infamy' in this context is 'B. dishonor.' This choice reflects the outrage over the attack that led the U.S. to enter World War II.
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