Hebe was Greek goddess of youth, and something else I now forget. Hebephrenia is an obsolete psychiatric term for a form of schizophrenia characterized by inappropriate silly childishness. So I thought "hebetude" ought to be a synonym for childiness, but dictionary just says "dullness", which doesn't make much sense to me.

Maybe unrelated to your Goddess friend:

http://www.m-w.com/cgi-bin/dictionary?book=Dictionary&va=hebetude

hebetudinous...lethargic...

Hebetudinous carries some of the weight of lethargy.

Dear Faldage: I was mixing Greek and Latin again.Shame on me.

Hebe was also one of the cupbearers to the gods.

Bingley