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Adjective: bumpy (bumpier,bumpiest)  búm-pee
  1. Causing or characterized by jolts and irregular movements
    "a bumpy ride";
    - rough, rocky, jolty, jolting, jumpy
  2. Covered with or full of bumps
    "a bumpy country road"

Derived forms: bumpiest, bumpier

See also: rough, unsmooth

Encyclopedia: Bumpy