If only the word hyponasty really did describe someone with such an irresistible desire to do evil that he went about proclaiming no one can stop me now! before falling, complete with fluffy white cat, into an elephant trap he'd dug for someone else earlier then hyponasty might be one of my favourite words.
Sadly, it describes the process where a plant grows extra cells on its undersides, making its stems etc turn upwards.
Word Not To Use Today: hyponasty. The word-beginning hypo- comes from the Greek hupo, under. The word-ending -nasty comes from the Greek nastos, pressed down.
This derivation makes no sense to me at all.