The idea that the earth was a sphere was a far-fetched idea for people of the middle ages, but people eventually came aROUND.

The believe that Shaimaa is not a kind person is far-fetched, in fact she IS the kindest Princess. :)))))))

'far fetched' means unconvincing or unlikely Example Teacher: Where is your homework? Student:The monsters ate it! Teacher: Nonsense! What a far fetched [ unlikely] story!

The story he told about the dog eating all his homework seems far-fetched.

Use it like any other adjective.