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Adjective: squirrelly
Usage: N. Amer, informal
  1. Being in a tense state
    "The squirrelly suspect kept glancing around the interrogation room";
    - edgy, high-strung, highly strung [Brit], jittery, jumpy, nervy, overstrung, restive, uptight [informal], high-keyed
     
  2. Eccentric or crazy
    "He's been acting kind of squirrelly lately"

See also: tense