Solilological

adj. (of a person's mental characteristic) prone to interminable soliloquizing.

That person is very solilological.

axiologodigniverbumical

adj. not worthy of being an actual word.

Axiologodigniverbumical is... axiologodigniverbumical wait-

pseudoword

n. a word that is not actually a word; a made up word.

pseudoword is a pseudowor—wait, uh, no, no–I mean, it IS a word it's just not, uh