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Use "unserious" in a sentence
"Those who opposed it were dubbed unserious peaceniks not just by warmongering Republicans but by the Elite Punditocracy like Tom Friedman and Richard Cohen."
"However "to fiddle while Rome burns" can rightfully be called unserious, with all pejorative meanings intended."
"Obama, who said again toward the end of his answer that drug legalization is "worth a serious debate," lent legitimacy to a policy area that has long been relegated to the "unserious" corner of American political discourse."