Adjective

 This is a true story.

True is adjective here because it describes the story. 

It is untrue.

Untrue is the adjective here.

Untrue describes 'it'. 

I have a black car.

I bought a new phone. 

Cardinal number - one, two, three

Ordinal numbers - first, second, third 

The first three students will get the prize. 

Ramesh is a thin boy.

Dinesh is a kind person.

Little     less   least