thet·ic 
(thĕtĭk, thētĭk) also thet·i·cal (thĕtĭ-kəl, thētĭ-)
(thĕtĭk, thētĭk) also thet·i·cal (thĕtĭ-kəl, thētĭ-)adj.
1. Beginning with, constituting, or relating to the thesis in prosody.
2. Presented dogmatically; arbitrarily prescribed.
[Greek thetikos, from thetos, placed, from tithenai, to put; see dhē- in the Appendix of Indo-European roots.]
theti·cal·ly adv.