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Adjective: overstrung  'ow-vu(r)'strúng
  1. Being in a tense state
    "overstrung parents are sensitive themselves";
    - edgy, high-strung, highly strung [Brit], jittery, jumpy, nervy, restive, uptight [informal], high-keyed, squirrelly [N. Amer, informal]
     
  2. Too tightly strung
    "an overstrung archery bow"

See also: tense