Found 35 synonyms in 7 groups
  1. 1
    Meaning: indomitable
  1. 2
    Meaning: unconquerable
  2. 3
    Meaning: fast
    impregnablestrongresistant
  3. 4
    Meaning: resistant
    faststrongimpregnable
  1. 6
    Meaning: defensible

impregnable synonyms - English related words for impregnable