The Collaborative International Dictionary of English v.0.48:

Pervasive \Per*va"sive\ (p[~e]r*v[=a]"s[i^]v), a.
   Tending to pervade, or having power to spread throughout; of
   a pervading quality. "Civilization pervasive and general."
   --M. Arnold.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pervasive
    adj 1: spreading or spread throughout; "armed with permeative
           irony...he punctures affectations"; "the pervasive odor
           of garlic"; "an error is pervasive if it is material to
           more than one conclusion" [syn: permeant, permeating,
           permeative, pervasive]

Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "pervasive":
   absolute, all-embracing, all-encompassing, all-out, all-pervading,
   born, broad-based, clean, clear, comprehensive, congenital,
   consummate, deep-dyed, downright, dyed-in-the-wool, egregious,
   exhaustive, general, inescapable, intensive, omnibus, omnipresent,
   out-and-out, outright, penetrating, perfect, permeating,
   permeative, pervading, plain, plumb, prevalent, pure, radical,
   regular, sheer, straight, suffusing, suffusive, sweeping, thorough,
   thoroughgoing, through-and-through, total, ubiquitous,
   unconditional, universal, unmitigated, unqualified, unreserved,
   unrestricted, utter, veritable, wholesale, widespread