Someone who is just a pain in the ass, a hassle, a nuisance, or all of the above. More often than not is your significant other.

Original Liability: Daelyn Henderson

A stupid person; it refers to the lack of surface area on an individual's brain. The general thought is that the more surface area (wrinkles, creases, etc.) a brain has, the smarter the person is. Conversely, a person with a smooth brain (no wrinkles) has less surface area and would therefore be stupid.

A person who stays and free loads at your expense and property. Someone who asks for favors day after day.

1)A person who gives a lot of promises, but never keep them. Note that this word is inapplicable to strangers.
2)Unreliable "pal", who WILL NOT support you in serious situation.

A liability takes money out of my pocket

A person (usually female) who becomes a hassle and general embarrassment when drunk. However, they are harmless and cause more laughter/ stories/ material for blackmail than utter humiliation and upset for their minders (usually male).

n. (accounting) Debts.