It's pretty clear to me now that "can't rout" is not one of the effects of feeblemindedness.
Febblemind gives you Morale 30, not Morale 50 (mindless). Morale 50 and 99 are the only ones where you never rout (not even from your own HP loss).
Feebleminded can also be Mind Hunted/Charmed/etc. (Even more easily in fact, because of the MR penalty).