addled

Concise Oxford English Dictionary © 2008 Oxford University Press:
addle/ˈadl/

▶verb (often as adj. addled)

• 1 confuse.

• 2 (of an egg) become rotten, producing no chick.

▶adjective

• 1 not clear or cogent; muddled: the film is addle-brained.

• 2 archaic (of an egg) rotten.

– origin ME: from OE adela ‘liquid filth’, of Gmc origin.