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Adjective: underdone  'ún-du(r)'dún
  1. Insufficiently cooked
    "she served us underdone bacon and burnt biscuits";
    - half-baked
Verb: underdo (underdid,underdone,underdoing,underdoes)  ,ún-du(r)'doo
  1. To do less than is requisite or proper
    "They underdid the decorations for the party"
     
  2. To cook insufficiently
    "Be careful not to underdo the chicken"

See also: raw