Far-fetched (adjective)

1. Unlikely to be true or to happen; not probable.
2. Unbelievable or implausible.

Origin:

Compound word of far + fetched, meaning "distant and unlikely".

Examples:

1. The story sounded far-fetched, but it turned out to be true.
2. The idea of traveling to the moon seemed far-fetched at the time.
3. The explanation seemed far-fetched, but it was the only one that made sense.
4. The conspiracy theory was far-fetched and unsupported by any evidence.
5. The claim that the new product could cure all diseases seemed far-fetched to most people.