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Adjective: lopsided  'lóp,sI-did [N. Amer], 'lóp'sI-did [Brit]
  1. Having one side lower, smaller or lighter than the other
    "The lopsided cake looked as though it might topple over"
     
  2. Turned or twisted toward one side
    "a...youth with a gorgeous red necktie all lopsided";
    - askew, awry, cockeyed [informal], wonky [informal], skew-whiff [Brit, informal]

See also: asymmetric, asymmetrical, crooked