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Use "unsingable" in a sentence
"The Star-Spangled Banner is notoriously unsingable."
"Sometimes this is the case but many times it is something both literally unspeakable and unsingable."
"I further promise to smile with good-natured indulgence when the news-media mispronounce my name, and also to change the national anthem from the totally unsingable "Star Spangled Banner" to the much more melodious and overtly patriotic "America the Beautiful.""