This can manifest in many ways, including:
* Uncleanliness: Body odor, unwashed hair, dirty clothes.
* Dental issues: Bad breath, tooth decay, gum disease.
* Skin problems: Infections, rashes, acne.
* Untrimmed nails: Can harbor dirt and bacteria.
* Neglecting handwashing: Spreading germs and illness.
So, in short, anything that represents a failure to maintain basic cleanliness and grooming can be considered the opposite of good personal hygiene.