<span class="searchmatch">perfidiōsae</span> inflection of perfidiōsus: nominative/vocative feminine plural genitive/dative feminine singular...
perfidiōsī <span class="searchmatch">perfidiōsae</span> perfidiōsa genitive perfidiōsī <span class="searchmatch">perfidiōsae</span> perfidiōsī perfidiōsōrum perfidiōsārum perfidiōsōrum dative perfidiōsō <span class="searchmatch">perfidiōsae</span> perfidiōsō...