The Collaborative International Dictionary of English v.0.48:

Cyclopean \Cy`clo*pe"an\ (s?`kl?-p?"an), a. [L. Cyclopeus, Gr.
   ?????, fr. ????? Cyclops: cf. F. cyclopeen.]
   Pertaining to the Cyclops; characteristic of the Cyclops;
   huge; gigantic; vast and rough; massive; as, Cyclopean
   labors; Cyclopean architecture.
   [1913 Webster] Cyclopedia

WordNet (r) 3.0 (2006):

cyclopean
    adj 1: of or relating to or resembling the Cyclops; "Cyclopean
           eye"

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "Cyclopean":
   Antaean, Atlantean, Briarean, Brobdingnagian, Gargantuan,
   Herculean, Homeric, abysmal, astronomic, colossal, elephantine,
   enormous, epic, giant, giantlike, gigantic, heroic, huge, immense,
   infinite, jumbo, mammoth, mighty, monster, monstrous, monumental,
   mountainous, prodigious, profound, stupendous, titanic, towering,
   tremendous, vast