inextirpable
1. [ adjective ] incapable of extermination or extirpation
Synonyms: inexterminable
Examples:

"some weeds seem inextirpable"

Related terms: ineradicable
Similar spelling:   insatiable
  inestimable
  inextricable
  inextensible
  inexterminable
  insatiably
  inextricably