ADDLE

v. & adj.

--v.

1. tr. muddle, confuse.

2 intr. (of an egg) become addled.

--adj.

1. muddled, unsound (addle-brained; addle-head).

2 empty, vain.

3 (of an egg) addled.

Etymology: OE adela filth, used as adj., then as verb