Other Word Forms of Serious
Origin of Serious
From Middle English seryows, from Old French serieux, from Medieval Latin sÄ“riōsus, an extension of Latin sÄ“rius (“grave, earnest, serious"), from Proto-Indo-European *swÄ“r- (“heavy"). Cognate with German schwer (“heavy, difficult, severe"), Old English swÇ£r (“heavy, grave, grievous"). More at swear, sweer.
Middle English from Old French serieux from Late Latin sēriōsus from Latin sērius
From American Heritage Dictionary of the English Language, 5th Edition
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