Synonyms of crackbrained

1 Syllable

daft, mad

2 Syllables

schizoid, manic, foolish, distraught, whacko, maniac, fruity, frenzied, unglued, psycho, schitzy, unsound

3 Syllables

distracted, bananas, psychotic, maniacal, unhinged, lunatic, idiotic, delirious, demented, deranged, bemused

4 Syllables

psychopathic, hysterical, unbalanced