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Adjective: high-keyed  hI keed
  1. Being in a tense state
    "high-keyed parents are sensitive themselves";
    - edgy, high-strung, highly strung [Brit], jittery, jumpy, nervy, overstrung, restive, uptight [informal], squirrelly [N. Amer, informal]
     
  2. (photography) brightly lit with minimal shadows and reduced contrast
    "The high-keyed lighting gave the scene an ethereal quality";
    - high-key

See also: tense