Step 1: Read the question.
Under the Consumer Protection Act, 2019, what are one-sided agreements called in law.
Step 2: Understand one-sided agreements.
A one-sided agreement has terms that heavily favour one party, usually the seller or service provider. The consumer has little bargaining power and must accept unfair terms.
Step 3: See examples.
Examples include very high security deposits, harsh penalties, and clauses letting one side cancel the deal as it likes.
Step 4: Match with the legal term.
Such heavily one-sided contracts are known in law as unconscionable contracts. The 2019 Act treats them as unfair contracts.
Step 5: Check the other options.
Unfair trade practice means deceptive selling, not a one-sided contract. A quasi contract is an obligation created by law. A unilateral contract is accepted by performing an act. None of these mean a one-sided agreement.
Step 6: Final answer.
So one-sided agreements are unconscionable contracts.
\[ \boxed{\text{Unconscionable contracts}} \]