–noun
the state of being dull; lethargy.
Etymology:
1615–25; from Late Latin hebetd, from Latin hebes, hebet, dull.
—Related forms
heb·e·tu·di·nous, adjective
Usage:
Plauged by hebetude brought on by too much barbeque and too much heat, I've been lax about searching for new and interesting words this week. I hope this one will suffice to sustain your interest.