An unconditioned behavior is not brought about by learning. Sneezing is an unconditioned behavior. Unconditioned also means without conditions, as in unconditioned love, which is love that will always be, even if your mate starts wearing socks with sandals.

There are two sense of unconditioned, but they both involve things that happen regardless of outside events. An unconditioned behavior is innate — babies aren't taught (or conditioned) to cry, so that behavior is unconditioned. Other uses of unconditioned mean that something has no conditions and could last forever, like unconditioned peace, or even an unconditioned agreement that will be honored in any circumstances. No conditions can stop it.

Definitions of unconditioned
  1. adjective
    not established by conditioning or learning
    “an unconditioned reflex”
    synonyms: innate, unlearned
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    conditioned, learned
    established by conditioning or learning
  2. adjective
    not conditional
    synonyms: unconditional
    blunt, crude, stark
    devoid of any qualifications or disguise or adornment
    fixed and absolute and without contingency
    not limited or restricted
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    imposing or depending on or containing a condition
    contrary to fact, counterfactual
    going counter to the facts (usually as a hypothesis)
    contingent, contingent on, contingent upon, dependant on, dependant upon, dependent on, dependent upon, depending on
    determined by conditions or circumstances that follow
    dependant, dependent, qualified
    contingent on something else
    probationary, provisional, provisionary, tentative
    under terms not final or fully worked out or agreed upon
    subject to a proviso
    limited or restricted; not absolute
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