The antonyms for "neat as a pin" can range from disorganized, chaotic, messy, cluttered, untidy, sloppy, to haphazard. A disorganized person might have excuses for why they are living in a cluttered home, and their surroundings might reflect their mental state of confusion. Chaotic can take the messy aspect of disorganized up a notch, with the added emotion of drama, like a whirlwind of disarray. Messy and untidy are understandable in a busy household, but if you start seeing mould or rotten food, then that's more than just your typical mess. Sloppy and haphazard can indicate a lack of care, which could lead to bigger issues in life.