A more thorough explanation:

covinous (/ˈkɒvɪnəs/), adj. Hist. Of a deceitful or fraudulent nature.

• He was accused of covinous behavior for embezzling company funds.
• The covinous scheme involved falsifying documents to obtain a loan.

These examples illustrate how covinous behavior involves deceit and fraud. In the first example, the person is accused of embezzling company funds, which is a form of fraud. In the second example, the scheme involves falsifying documents, which is also a form of deceit and fraud. Covinous behavior is often illegal and can result in serious consequences.