Safari no opening

Try opening Safari in Safe Mode:

Use safe mode to isolate issues with your Mac - Apple Support

Try Safari in a new user account:

macOS Sierra: Set up users, guests, and groups on your Mac

If neither of those work try reinstalling Safari by either reinstalling Mac OS, or by using the latest Combo Update for your system software.

How to reinstall macOS from macOS Recovery - Apple Support

Are you using Yosemite?

See if anything here helps.

https://discussions.apple.com/thread/250021459

https://discussions.apple.com/thread/8573312?page=2

Try setting up another admin user account to see if the same problem continues. Please post back on whether or not this worked. Also try the Safe Mode. Please post back on whether or not this worked.

Isolating an issue by using another user account 

Safe Mode - About

If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor.  Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown.

Etrecheck – System Information

If the log won’t post, try posting it here and provide a link in a reply        Pastebin

Hello there have you tried undownloading and then redownling it