headless
1. [ adjective ] not having a head or formed without a head
Examples:

"the headless horseman" "brads are headless nails"

Related terms: headed beheaded acephalous
2. [ adjective ] not using intelligence
Synonyms: brainless
Related terms: unintelligent
Similar spelling:   heedless
  heedlessly
  heatless
  headlike
  head_lice
  head_louse
  headlock