The correct answers are: Void; Unenforceable; Voidable.
A contract may be described as 'unfair' or 'improper' in everyday terms, but it will not necessarily be invalid. The other three words are legal terms. A void contract has no legal existence and a voidable contract is one which can be cancelled by one party. Unenforceable contracts exist technically but courts refuse to enforce them because of a legal defect.
