Deliberate withholding of material facts that would affect the validity of an insurance policy or a claim under the policy is known as:

Slanting refers to presenting information in a biased or misleading way but does not specifically address the withholding of material facts. It generally involves manipulating facts or opinions to favor a particular viewpoint rather than the intentional act of concealing information relevant to an insurance policy.

Misrepresentation involves providing false information or distorting the truth about a fact related to an insurance policy. While it is related to dishonesty, it specifically refers to presenting incorrect information rather than the act of withholding relevant material facts altogether.

An aleatory contract is a type of agreement where the performance of one party is contingent on an uncertain event, such as an insurance policy where the payout depends on a claim being made. This term does not pertain to the act of withholding facts but rather describes the nature of the contract itself.