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The Collaborative International Dictionary
Rationalistical

Rationalistic \Ra`tion*al*is"tic\ (r[a^]sh"[u^]n*al*[i^]s"t[i^]k), Rationalistical \Ra`tion*al*is"tic*al\ (-t[i^]*kal), a. Belonging to, or in accordance with, the principles of rationalism. -- Ra`tion*al*is"tic*al*ly, adv.

Wiktionary
rationalistical

a. (synonym of rationalistic English)