there are many more, not all of which (I hasten to add ;) are obscure; e.g.,
adventitious, sacrilegious, supercalifragilisticexpialidocious. if you further restrict them to those containing
only one of each, then we can talk about obscure words (arsenious, for example
).
p.s. - here's one that's not so obscure, from MWCD
abstentious - characterized by abstinence; self-restraining or refraining