Etymology

suddent

S1U1D2D2E1N1T1
Middle English sodand
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The story

  1. Middle English · inherited fromsodand
  2. English todaysuddent

From Middle English sodand, alternative form of sodeyn, by reanalysis of the ending as -and, -end, -ent (“present participle suffix”).

Etymology from Wiktionary, CC BY-SA 4.0.