Etymology

challenging

C3H4A1L1L1E1N1G2I1N1G2

Today it means: Difficult, hard to do. Full definition →

Middle English chalengynge
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The story

  1. Middle English · inherited fromchalengynge
  2. English todaychallenging

From Middle English chalengynge; equivalent to challenge + -ing.

Etymology from Wiktionary, CC BY-SA 4.0.