illegality; unlawfulness
Primarily a legal term referring to the quality or state of being illegal. Often used in formal contexts such as law, contracts, and official discussions.
The illegality of the act was disputed in court.
Point out the unlawfulness of the contract.
Compound of 違法 (illegal) + 性 (-ness, -ity). The suffix 性 is commonly used to form abstract nouns indicating a quality or property.