scatterbrained

adjective

I've been so scatterbrained lately:

absent-minded, forgetful, with a mind like a sieve, disorganized, unsystematic;

dreamy, wool-gathering, with one's head in the clouds, feather-brained, feather-headed, birdbrained, empty-headed, erratic, giddy;

informal dizzy, dippy, not with it;

British, informal dappy, scatty.

▷antonyms organized, together.

scatterbrained Oxford Dictionary of English