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One who speaks vehemently or with anger or prejudice about a subject which they have little or no knowledge or experience of

A person who becomes indignant about a subject with which they have no personal or professional knowledge

A person who formulates strong opinions with no concurrent supporting evidence or reason for their belief
It took some effort, but Sarah Palin became a truly special public figure when she identified herself as both an indignoramus and an indignoranus during her resignation speech.
by PWojtisniewskie December 08, 2010
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