Bogus (adjective)

1. Not genuine or authentic; false.
2. Not true or real; not what it seems.

Origin:

The word bogus comes from the word "bogus" which was originally a slang word used to describe something fake or counterfeit. the word was first recorded in american english in 1842 and it comes from the word "bogue" which means "fraud" or "deception".

Examples:

1. The story was a bogus excuse for being late.
2. The check was found to be a bogus.
3. The product was found to be a bogus version of the original.
4. The credentials were found to be bogus.
5. He was caught using a bogus ID.