headless

adjective10

1. •
   Without a head (body part).
2. •
   Naturally having and needing no head.
3. •
   Synonym of decapitated.

   • How did the headless horseman see to chase Ichabod?
4. •
   Running without a graphical user interface; running without any attached output device (e.g., monitor) or input device (e.g., keyboard, mouse).

   • /redirect. Used for console redirection in headless servers. — 2003
5. •
   Without leadership.

   • The headless army blundered along after the death of their general, accomplishing nothing.
6. •
   Without a head (hardware or device feature).
7. •
   Without a head of foam.
8. •
   Not having a head morpheme or word.
9. •
   (no longer used) Rimless, not having a cartridge case rim (flange).

   • A headless shell doesn't have a flange.
10. •
    (no longer used) Heedless.

    • If any one will rashly blame such his choice of old and unwonted words, him may I more justly blame and condemn, either of witless headiness in judging, or of headless hardiness in condemning. — 1579