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Adjective: out on a limb
  1. Being or feeling set or kept apart from others
    - detached, isolated, separated, set-apart
  2. Remote and separate physically or socially
    - apart, isolated, obscure
  3. Lacking protection or defence
    - unprotected

See also: defenceless [Brit, Cdn], defenseless [US], exposed, insecure, naked, open, separate, susceptible, unconnected, unsafe, unshielded, vulnerable

Encyclopedia: Out on a limb