From klutz +‎ -y.

• enPR: klŭt'sē, IPA^(key): /ˈklʌtsi/

• Audio (Southern England):

  (file)

• Rhymes: -ʌtsi

klutzy (comparative klutzier, superlative klutziest)

1. (slang, derogatory) Awkward, clumsy or socially inept.
   • 1983 April 1, 'Fran C. Schlepper', “They Are Everywhere”, in Gay Community News, page 3:

     Life is a high wire act and there's no net. And most of us are klutzy, so watch out, here comes another splat.