obsolescent

Being in the process of passing out of use or usefulness; becoming obsolete.

Becoming reduced during the course of evolution; vestigial or nearly vestigial. Used of an organ or other part of an organism.

Becoming obsolete; passing out of use: as, an obsolescent word or custom.

In entomology, somewhat obsolete; imperfectly visible.

Going out of use; becoming obsolete; passing into desuetude.

In the process of becoming obsolete, but not obsolete yet.

becoming obsolete