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Adjective: twiddly (twiddlier,twiddliest)
  1. Easy to twiddle; easy to play with idly with the fingers
    "The pen had a twiddly clip that kept fidgety hands busy"
     
  2. (music) having a rapid series of notes
    "The guitarist added some twiddly bits to the solo"

Derived forms: twiddlier, twiddliest