unavoidable

from WordNet (r) 3.0 (2006)

unavoidable
    adj 1: impossible to avoid or evade:"inescapable conclusion";
           "an ineluctable destiny"; "an unavoidable accident" [syn:
           {ineluctable}, {inescapable}, {unavoidable}]

from The Collaborative International Dictionary of English v.0.48

Unavoidable \Un`a*void"a*ble\, a.
   1. Not avoidable; incapable of being shunned or prevented;
      inevitable; necessary; as, unavoidable troubles.
      [1913 Webster]

   2. (Law) Not voidable; incapable of being made null or void.
      --Blackstone.
      [1913 Webster]

   {Unavoidable hemorrhage} (Med.), hemorrhage produced by the
      afterbirth, or placenta, being situated over the mouth of
      the womb so as to require detachment before the child can
      be born.
      [1913 Webster] -- {Un`a*void"a*ble*ness}, n. --
      {Un`a*void"a*bly}, adv.
      [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

34 Moby Thesaurus words for "unavoidable":
      certain, definite, destined, determined, fated, fateful, fixed,
      indefeasible, ineluctable, ineludible, inescapable, inevasible,
      inevitable, inexorable, inflexible, irresistible, irrevocable,
      necessary, predestined, predetermined, relentless, resistless,
      settled, sure, sure as death, sure as fate, unalterable,
      unchangeable, uncontrollable, undeflectable, unevadable,
      unpreventable, unstoppable, unyielding