Wiktionary
priestliest
a. (context less common English) (en-superlative of: priestly) most priestly.
WordNet
priestly
adj. associated with the priesthood or priests; "priestly (or sacerdotal) vestments"; "hieratic gestures" [syn: hieratic, hieratical, sacerdotal]
befitting or characteristic of a priest or the priesthood; "priestly dedication to the people of his parish" [syn: priestlike] [ant: unpriestly]
[also: priestliest, priestlier]
priestliest
See priestly