far-fetched

(adjective) something that is very unlikely or unrealistic

Example Sentences:

The movie Volcano was too far-fetched. Something like that could never happen in real life.

A: I have an idea of how to improve our English school.
B: Okay, what is it?
A: I think we should force our teachers to live in each student’s house for one week. Then their English will be perfect.
B: That seems really far-fetched. Our teachers won’t want to do that!

Media:

Similar idioms:

1. half-baked idea
2. kick someone out
3. pay lip service