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Adjective: underhand  'ún-du(r),hand
  1. (sport) with hand brought forward and up from below shoulder level
    "an underhand pitch";
    - underhanded, underarm
  2. Marked by deception
    "achieved success in business only by underhand methods";
    - sneaky, underhanded
Adverb: underhand  'ún-du(r),hand
  1. Slyly and secretly
    "Mean revenge, committed underhand";
    - underhandedly
  2. With the hand swung below shoulder level
    "throwing a ball underhand";
    - underarm

See also: bent [Brit, informal], corrupt, crooked [informal]

Antonym: overarm

Encyclopedia: Underhand