Etymology

portentously

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Today it means: In an ominous manner. Full definition →

English portentous ← Middle English portentuous ← Latin portentōsus
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The story

  1. Latinportendō
  2. Latinportentum
  3. Latinportentōsus
  4. Middle Frenchportentueux
  5. Latinportentōsus
  6. Middle Englishportentuous
  7. Englishportentous
  8. English todayportentously

From portentous + -ly.

Etymology from Wiktionary, CC BY-SA 4.0.