Illegitimate (adjective)

1. Born to parents who are not married to each other.
2. Not legally or morally valid or acceptable.
3. Not in accordance with law or the rules.

Origin:

The word "illegitimate" is derived from the latin word "illegitimus" meaning not lawful. it is used to describe something that is not legally or morally valid or acceptable.

Examples:

1. The child was illegitimate and not recognized by his father.
2. The election was illegitimate and the results were nullified.
3. The company's profits were the result of illegitimate business practices.
4. The claim was illegitimate and was not taken seriously.
5. The government's actions were illegitimate and were met with resistance.