WordNet (r) 3.0 (2006):

nonspecific
    adj 1: not caused by a specific agent; used also of staining in
           making microscope slides; "nonspecific enteritis" [ant:
           specific]

Moby Thesaurus II by Grady Ward, 1.0:

58 Moby Thesaurus words for "nonspecific":
   abstract, aleatoric, aleatory, amorphous, bland, blobby, blurred,
   blurry, broad, chance, chancy, chaotic, collective, confused,
   disordered, featureless, foggy, fuzzy, general, generalized,
   generic, hazy, hit-or-miss, ill-defined, imprecise, inaccurate,
   inchoate, incoherent, indecisive, indefinable, indefinite,
   indeterminable, indeterminate, indistinct, inexact, lax, loose,
   nebulous, neutral, obscure, orderless, random, shadowed forth,
   shadowy, shapeless, stochastic, sweeping, uncharacterized, unclear,
   undefined, undestined, undetermined, undifferentiated, unplain,
   unspecified, vague, veiled, wide