How to Use "undesirable" with Example Sentences

1. The former is undesirable and the latter impossible .
2. Make plans to change undesirable behavior using the skills you 've already learned .
3. Critics think this gives the american authorities unjustified powers , for example to boot undesirable websites off the internet .
4. Could it still be undesirable ?
5. It would be difficult , and undesirable , to replicate those conditions .