Etymology

portentuous

por·ten·tu·ous
P3O1R1T1E1N1T1U1O1U1S1
First used 15th–19th c.
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The story

See portentous. By surface analysis, portent + -uous.

First known use, by meaning

  • 15th–19th c. Obsolete form of portentous.

Etymology from Wiktionary, CC BY-SA 4.0.