The Collaborative International Dictionary of English v.0.48:

Puristic \Pu*ris"tic\, Puristical \Pu*ris"tic*al\, a.
   Of or pertaining to purists or purism.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

89 Moby Thesaurus words for "puristic":
   Sabbatarian, bigoted, censorious, choicy, choosy, conscientious,
   creedbound, critical, discriminating, discriminative, dogmatic,
   dour, elegant, euphemistic, euphuistic, evangelical, exact,
   exacting, exquisite, fastidious, firm, formalistic, fundamentalist,
   goody good-good, goody-goody, hard, hidebound, hyperorthodox,
   impliable, inexorable, inflexible, iron, ironbound, ironclad,
   ironhanded, literalist, literalistic, methodical, meticulous,
   mincing, muscle-bound, namby-pamby, obdurate, obstinate, orderly,
   orthodox, overnice, overprecise, overrefined, particular, pedantic,
   perfectionistic, picky, precieuse, precious, precise, precisian,
   precisianist, precisianistic, precisionist, precisionistic,
   priggish, procrustean, prudish, punctilious, purist, puritan,
   puritanic, puritanical, relentless, rigid, rigorist, rigoristic,
   rigorous, rockbound, scrupulous, selective, sensitive, simpering,
   staunch, stiff, straightlaced, straitlaced, strict, stubborn,
   unbending, uncompromising, unrelenting, unyielding