ves·ti·gial

/vɛˈstıʤijəl/ adj

1 technical, of a body part : remaining in a form that is not fully developed or able to function

Although it cannot fly, the bird still has vestigial wings.

2 formal : remaining as the last small part of something that existed before

They uncovered vestigial traces of the home's original wallpaper.

She has some vestigial doubts about investing in the company.