Is there a way to delete/remove/undo a vcard that I had imported to iCloud?

I found a faster way, the same thing just happened to me, you will need a mac, perhaps it works from the iCloud website. You just need to click con file>New Smart Group and in the options you choose "created after" and set the day you imported all those contacts. Then you just push shift, click on the first and the last contact of that group and delete them.

Unfortunately, not easily.* Not unless you had a vCard of the original contact list so you could delete all contacts and reimport the original.

*If you had an iCloud backup of your phone prior to this happening, you may be able to restore the contacts from your backup by following the process outlined here: Recovering deleted iCloud contacts from an iCloud backup.

You're welcome. Depending on how much trouble it is to delete them manually, you could always back up your phone to your computer using iTunes, then try restoring the correct contact list from your iCloud backup (if you have one), following the steps in the linked user tip.

There is an easy way to delete vcard contacts if all contacts have a similar tagline. If they are under a specific card category (like a summer job title) then all you have to do is

1. go on your contacts on your laptop (your iPhone contacts must be synced to your MacBook contacts),

2. search for all contacts with the specific tag or title on the vcard, (i.e. summer job),

3. click on the first one, hold shift and click on the last contact (let go of shift after clicking on last contact),

4. right left menu to delete all contacts.

Then on iTunes under the Advanced box on the contacts page (or "Info") click the box that says Contacts to "Replace information on this iPhone"

This is a lot easier than deleting 500+ contacts individually on your phone