legitimategrounds

noun
UK /lɪˈdʒɪtɪmət ɡraʊndz/
US /ləˈdʒɪtəmət ɡraʊndz/

Good and fair reasons for doing something.

The teacher had legitimate grounds to give the class extra homework because nobody listened.


OTHER MEANINGS

2. Reasons that are allowed by the law.

The police needed legitimate grounds before they could search the car.

3. A fair and honest reason for a complaint or disagreement.

She had legitimate grounds to complain when her order never arrived.

4. Reasons that make sense and are not made up.

There are legitimate grounds to believe the old bridge needs repairs.